Search

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The experiment was to investigate the effect of different planting densities on the yield and quality of MT-8 in F8 generation of distant hybrid of maize and teosinte. MT-8 was used as the research material, and six planting densities of 52 500, 60 000, 67 500, 75 000, 82 500, and 90 000 plants/hm² were set up. The results showed that the both fresh weight and dry weight of MT-8 increased with the increase of planting density, and reached the maximum value when planting density was 75 000 plants/hm². At a planting density of 75 000 plants /hm², MT-8 had higher nutrient yield and higher feeding value, and the nutrient type was NC. The study indicates that the suitable planting density of MT-8 is 75 000 plants /hm². [ABSTRACT FROM AUTHOR]

To explore the photosynthetic system adaptation mechanism of two dominant ephemeral plants, including Malcolmia scorpioides and Arnebia decumbens, to light and temperature, this study measured the chlorophyll fluorescence parameters and discussed their light damage and the change of photosynthetic activities under different temperatures(25-60 ℃)and constant room temperature(25 ℃)and high temperature and different illumination(80-400 μmol·m-2·s-1). The results were as follows:(1)The photosynthetic efficiency and electron transport rate increased first and then decreased with the increase of temperature, reached the highest value at 40 ℃ and then rapidly decreased, the quantum yield of non-regulated energy dissipation in PS Ⅱ [Y(NO)] and PS I receptor side heat dissipation efficiency [Y(NA)] increased, and the photosynthetic system was damaged due to the accumulation of excitation pressure at the receptor terminal.(2)Under the light range of 80-400 μmol·m-2·s-1 and room temperature, the photosynthetic efficiency increased with the enhancement of light intensity; under high temperature, the combined stress of light and high temperature on plants descended the photosynthetic activities of plants and the quantum yield of regulatory energy dissipation in PS Ⅱ [Y(NPQ)], and when the light intensity reached 320 μmol·m-2·s-1, the ring electron transport flow disappeared. In conclusion, light and temperature within a certain range can improve the photosynthetic activity, activate heat dissipation and ring electron transport flow and reduced photoinhibition. However, with the increase of temperature and light intensity at high temperature, the adaptation ability of the two ephemeral plants decrease and the photoprotective mechanism disappeared. The main reason is the accumulation of PS I receptor side excitation pressure and the failure of regulatory heat dissipation. [ABSTRACT FROM AUTHOR]

Plant height and its relative traits are key factors that affect plant type and yield of sorghum. Mapping major QTL for these traits may provide a basis for genetic improvement in sorghum. In this study, a RI population including 205 lines obtained from a cross between American cultivar BTx623 and Guizhou liquor-brewing cultivar Hongyingzi was used to investigate plant height and internode numbers under five environments. The genetic map was constructed based on genotype data from Super-GBS technology, and major QTLs were identified by inclusive composite interval mapping（ICIM）. Totally, eighteen major QTLs were detected on chromosome 1, 3, 4, 8, and 9, of which 7 and 11 QTLs were related to plant height and internode numbers, respectively. Ten major QTLs were repeatedly detected in multiple environments or two traits, of which qPH9.1 was consistent with the known plant high gene Dw1, while qPH1.2, qPH3.2, qIN3.2 and qIN8.1 were colocalized with four homologous genes involving in plant height or internode elongation in rice. [ABSTRACT FROM AUTHOR]

【Objective】 In order to establish the reasonable planting density under the double-row planting model of large ridges and build a high-yielding peanut group model, the impact of the double-row planting density of large ridges (90 cm) on the characteristics, group structure changes and yield of peanut plants was studied.【Method】 The semi-trailing type peanut variety ‘Silihong’ and the erect type ‘Jihua26’were used as experimental materials. Set 6 planting densities: M1 (31.71×104 plants/hm² ), M2 (27.75×104 plants/hm² ), M3 (24.67×104 plants/hm² ), M4 (22.20×104 plants/hm² ), M5 (18.50×104 plants/hm² ), M6 (15.85×104 plants/hm² ), based on single ridge (60 cm) double-seed sowing (11.93×104 holes/hm² ) as a comparison (CK). Determine the seedling rate, plant growth, SPAD value, dry matter accumulation and yield of each peanut variety under different density, and establish a reasonable group structure of peanuts and the optimal planting density of different varieties.【Result】 The emergence time of different varieties was different under different planting densities, the emergence time of ‘Silihong’ was earlier than ‘Jihua 26’. 25 days after sowing, the seedling rate of ‘Silihong’ was up to 100% at M3 density, 30 days after sowing, the seedling rate of ‘Jihua26’ was up to 100% at M3 density, which were significantly higher than other densities. With the decrease of planting density, the height of the main stem and the length of the side branch gradually increase with the decrease of the number of plants per unit area; the SPAD value tends to increase first and then decrease with the decrease of planting density; ‘Jihua 26’ with the decrease of density, the quality of dry matter showed a tendency to rise first and then decrease, and ‘Silihong’ the accumulated amount showed a trend of gradually increasing. With the reduction of planting density, the number of pods per plant, pod yield per plant and weight of 100-pod increased first and then decreased of the two experimental varieties, the highest value was under M4 density of ‘Jihua26’ and M5 density of ‘Silihong’, which were significantly higher than other densities. The yield of the two experimental varieties continues to increase, Jihua 26 at M4 density had highest yield was 7 956.67 kg/hm² and ‘Silihong’ at M5 density had highest yield was 4 790.73 kg/hm², compare to control increase 96.14% and 65.42% respectively. 【Conclusion】 Compared with the singlerow double-seed planting mode, the large ridge double-row + single-seed planting mode can increase the peanut height, SPAD and dry matter accumulation. At the same time, the yield is improved. Under the condition that the density remains unchanged, peanuts can be changed from double-seed to single-seed precision sowing, which increases the yield. When planting in two rows of large ridges, the appropriate sowing density should be selected according to the type of peanut varieties. The M5 density of the semi-trailing type peanut varieties is the best, and the M4 density of the erect type peanut is the best [ABSTRACT FROM AUTHOR]

Artemisia selengensis Turcz. is a typical rhizome plant. It has high feeding value, rich nutrition, good palatability, strong disease and insect resistance. In order to explore the effects of planting density on the yield and growth of Artemisia selengensis rhizome, wild Artemisia selengensis Turcz. was taken as the experimental material, adopted the method of ramet propagation. The test set up four planting densities, which of 83 000, 111 000, 167 000 and 250 000 plants per hectare, respectively. The fresh grass yield, hay yield, the number of rhizome buds, rhizome dry weight, spacing of rhizome node, rhizome diameter, and ramet biomass under different planting densities were measured. The results showed that with the increase of planting density, the spacing of rhizome nodes, the number of rhizome buds, the diameter of rhizome and the biomass of ramet decreased, the dry weight of rhizome increased. The highest fresh grass yield was found at a density of 83 000 plants per hectare, with a fresh grass yield of 13 894.70 kilogram per hectare and a dry grass yield of 4 353.33 kilogram per hectare. The planting density of 83 000 plants per hectare increased the fresh grass yield by 29.24% (P<0.05) compared to 250 000 plants per hectare, and the dry grass yield increased by 32.75% (P<0.05). The rhizome node spacing of 83 000 plants Artemisia selengensis Turcz. was 113.56% longer (P<0.05), the number of rhizome buds was more than 59.54% (P<0.05), the rhizome diameter was more than 49.26% (P<0.05), and the rhizome dry weight was less than 53.06% (P<0.05). It showed that the planting density had a significant impact on the yield and rhizome growth of forage Artemisia selengensis Turcz., with 83000 plants per hectare being the most suitable planting density. [ABSTRACT FROM AUTHOR]

Sugarcane is prone to disorder in the process of transversal elevating sowing. A high missed-seeding index and a low qualified index can result in low germination rates for the total yield of sugarcane. In this study, an elevating type sugarcane seed metering device was designed with the function of seed clearing and reseeding. The device shared multiple functions, including cane separation, sorting, dynamic elastic seed clearing, and automatic grading adjustment in the process of elevating transportation. Firstly, the key structural and operating parameters of the seeding device were determined the impact on the seeding performance using dynamic analysis in the processes of cane separation, clearing, and reseeding during the elevating and sowing of transversal sugarcane. Then, the collision between sugarcane and elastic board was simulated using the EDEMRecurDyn coupling platform. The force acting on the sugarcane was calculated in the process of seeding and clearing. A series of push and compression tests were carried out to determine the parameters of the elastic plate. The deformation mechanism of the elastic board was used to clarify the force on the sugarcane. A blocking test was conducted on the sugarcane collection box. The gap was determined between the seed guide plate of the cane collecting box and the bottom of the seed separating and cleaning board, in order to ensure smooth and unobstructed movement of the sugarcane and unobstructed falling of sugarcane. A PVC seed planting platform was selected to launch a single-factor experiment. The optimal solution range was narrowed down in the experiments. A quadratic regression orthogonal rotation combination experiment was conducted on a single-factor experiment, in order to obtain the optimal performance parameters of the seed metering device. A regression mathematical model was established to analyze the effects of the length of the first and second clearing and reseeding area and the seeding belt speed on the miss-seeding index, multiple-seeding index and qualified index. The test results showed that the significant coefficients of the length of the first and second seed clearing and reseeding area were less than 0.01, indicating a significant impact on the miss-seeding index, multiple-seeding index and qualified index. The speed of the seeding belt shared a significant impact on the miss-seeding index, with a significance coefficient of less than 0.01. However, there was no significant impact on the multiple-seeding index and qualified index, with significance coefficients greater than 0.05. After multi-objective optimization, the optimal parameter combination was determined to be: the length of the first-level seed cleaning and reseeding area was 13 cm, the length of the second-level seed clearing and reseeding area was 16 cm, and the speed of the seed metering belt was 97 mm/s. The validation test showed that the miss-seeding index was only 1.7%, the multiple-seeding index was 3.5%, and the qualified index was 94.8% under this optimal combination. The miss-seeding index of the metering device was reduced by 75%, and both the multiple-seeding index and the qualified index were improved significantly, compared with the 6.9% miss-seeding index of the conventional elevating type seed metering device. This device can be expected to achieve a reduction in the miss-seeding index and an improvement in the qualified-seeding index of sugarcane. This finding can lead to promoting accurate planting and high yield in sugarcane planting. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Northwest A & F University - Natural Science Edition is the property of Editorial Department of Journal of Northwest A&F University (Natural Science Edition) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In this study, Dabaigu was taken as the control, the main agronomic traits and nutrient quality of the millet varieties including Jingu 21, Jingu 59, Datong 45, Xingu 4, and 8311 were researched to provide guidance for the introduction of millet in the spring millet area of northern Shanxi province. The results showed that the growth duration of the tested millet varieties was from 116 to 138 days, and Jingu 59 had the longest growth duration, it was 138 days and 8311 had the shortest growth duration, it was 116 days. Both the weight per spike and grain weight per spike of Jingu 59 were the largest in the two years, however, 1000-grain weight of Datong 45 and Xingu 4 was the largest with the significant differences compared with other millet vanities. In the two years, the yield of Jingu 59 ranked first and Jingu 21 for second. The yield of Jingu 59 and Jingu 21 was 6 557.69 kg/ha and 6 421.14 kg/ha respectively in 2019, and 6 478.70 kg/ha and 6 104.65 kg/ha in 2020 respectively. The protein content of Jingu 21 was the highest in both years, it was 13.90% and 10.30% respectively, which was significantly different from that of other millet varieties. Jingu 59 millet had the highest content of fat and dietary fiber in 2019, and Jingu 21 millet had the highest content of fat and dietary fiber in 2020. The study demonstrated that the coefficients of variation were greater for yiled, spike width, weight per spike, grain weight per spike, 1000-grain weight, and the content of protein, fat, and dietary fiber. There was a significantly positive correlation between yield and plant height, spike width, weight per spike, grain weight per spike, 1000-grain weight, and protein content. Comprehensive analysis showed that Jingu 21 and Jingu 59 were suitable for being extened and planted in Guangling county in the spring millet area of northern Shanxi provinc [ABSTRACT FROM AUTHOR]

Copyright of Journal of Irrigation & Drainage is the property of Journal of Irrigation & Drainage Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study aimed to explore the difference of traits among provenances and select individual plants with good traits, including high yield. The variation of 15 seed traits of 121 individual plants of Xanthoceras sorbifolia introduced from four regions (Changji of Xinjiang, Wengniute Banner of Inner Mongolia, Yinchuan of Ningxia, and Zhangjiakou of Hebei） to Weifang of Shandong were collated, and the correlation between the traits was analyzed. Principal component analysis, the fuzzy membership function method, and multi-dimensional coordinate vector comprehensive evaluation value accumulation methods were used to select excellent individual plants. The results showed that single fruit fresh weight, single fruit seed weight, and 100-kernel weight varied significantly among provenances, where the coefficients of variation (CV) were 28.53%, 22.41%, and 21.34%, respectively. Additionally, the CV of the kernel oil content was 7.75%.Specifically, the seed yield per plant in Yinchuan, Ningxia was significant, but that in the other provenances was not significant. Furthermore, significant or extremely significant differences existed in other characters among the four sources. Notably, the seed yield per plant and fresh fruit weight per plant increased as the seed longitudinal and transverse diameter increased. The 100-seed weight and 100-kernel weight increased as the single fruit fresh weight and fruit longitudinal diameter increased. Seed yield decreased as the seed coat thickness increased. Kernel oil content increased as the number of single fruit seed increased. Moreover, the 15 seed traits constituted 4 principal components: the yield factor, the yield rate, the oil production factor, and the seed rate. The four principal components represented 81.409% of the total information of the 15 traits investigated in this study. Subsequently, high-yield and high-oil type strains were selected using the results of principal component analysis. Changji 32 and 35（CJ-32, CJ-35） in Xinjiang, Wengniute Banner 455（WQ-455） in Inner Mongolia, Yinchuan 464（YC-464） in Ningxia and Zhangjiakou 314, and 319（ZJK-314, ZJK-319） in Hebei were ranked as the top 10 varieties. Crucially, the results obtained from the three analysis methods were consistent. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Northwest A & F University - Natural Science Edition is the property of Editorial Department of Journal of Northwest A&F University (Natural Science Edition) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to clarify the response of millet in summer sowing area of millet in Henan province to planting density and nitrogen application rate, in this study, taking Zhenggu 3 as the experimental material, a split plot experimental design was adopted, with planting density as the main area and nitrogen application rate as the sub-area. The effects of different planting density(400 000, 600 000, 800 000 plants/ha) and nitrogen application(pure N) level(0, 60, 120, 180 kg/ha) on millet yield and related agronomic traits were analyzed. The results showed that with the increase of planting density and nitrogen application level, the millet yield increased first and then decreased. The yield of 600 000 plants/ha was the highest, reaching 5 441.1 kg/ha. Regression analysis was carried out on the change of yield with planting density, and 580 000-730 000 plants/ha was determined as the best density. Among different nitrogen application levels, the yield of 120 kg/ha was the highest, which was 5 501.39 kg/ha. Regression analysis of yield change with nitrogen application level found that it was determined that 100-125 kg/ha was the best nitrogen application rate in the study region. There was a significant interaction effect between planting density and nitrogen application level on millet yield. The treatment with planting density level of 600 000 plants/ha and nitrogen application level of 120 kg/ha had the highest yield, which was 6 479.2 kg/ha. With the increase of planting density, spike length, stem diameter, spike diameter, single spike weight, grain weight per spike of millet, and 1000-grain weight under different treatments showed a downward trend. With the increase of nitrogen application level, spike length, stem diameter, spike diameter, single spike weight and grain weight per spike increased first and then decreased, which was the best in the treatment of 120 kg/ha. Based on the results above, the suitable cultivation method conducive to giving full play to the yield potential of Zhenggu 3 in the summer sowing area of millet in Henan province was seedling density of 600 000 plants/ha and nitrogen application of 120 kg/ha. [ABSTRACT FROM AUTHOR]

【Objective】The study aimed to understand the basic situation of released maize varieties in Sichuan province in recent 36 years, and the change trend of main agronomic traits with the annual replacement, so as to provide reference for maize breeding and production in Sichuan province in the future.【Method】The basic information of maize varieties released in Sichuan province from 1985 to 2020 were collected.And the statistical analysis and correlation analysis of main agronomic traits were carried out by using the R software and Excel.At the same time, the change trends of main agronomic traits with annual replacement were analyzed.【Result】The yield of released maize varieties in Sichuan province showed a significant increasing trend with the annual replacement.Average annual increasement was 227.55 kg/hm~2.The phenomenon of cross usage of the same parental inbred line in some released varieties existed, and the reuse rate was 60.1%.The plant height and ear position height of varieties fluctuated in a ‘W’ shape between years, and showed an overall increasing trend with the annual replacement.The plant height and ear position height of varieties released after 2003 were significantly higher than those before 2002.The average values of ear length, kernel row number, kernel number per row, hundred kernel weight, kernel volume weight, starch content, protein content, oil content and lysine content were 19.5 cm, 16.3 rows, 36.4 kernels, 30.9 g/L, 746.1 g/L, 73.06%, 9.93%, 4.59% and 0.30%, respectively.These traits showed an increasing or decreasing trend with the annual replacement.Correlation analysis showed that there was a negative correlation between yield and quality traits, and significant positive correlation existed between yield and plant traits.【Conclusion】The change trend analysis of plant traits, yield and yield related traits is mainly based on the test data in specific years and under specific environmental conditions, which can not represent the performance of varieties in the same years and the same conditions.The test data of quality traits are relatively stable, and the statistical results have certain reference value.Combined with the production and consumption situations of maize in Sichuan province, the statistical analysis results of the study can provide a reference basis for maize breeding and production in Sichuan province in the future. [ABSTRACT FROM AUTHOR]

The aim of this paper is to assess the loss of grain production caused by agrometeorological disasters in the Inner Mongolia Autonomous Region (IMAR), which is an important grain production base of China. The disaster-yield assessment model was formed and verified using grain production, yield, planting area and agrometeorological disaster conditions data of the IMAR from 1981 to 2020, and the loss of grain yield caused by meteorological disasters was assessed by this model. The results showed that grain production, yield and planting area observed an escalating trend from 1981 to 2020, and the rate of increase was 78.85×104t·y-1, 100.97kg·ha-1·y-1 and 74.48×10³ha-1·y-1. The covered and affected area of agrometeorological disasters for the IMAR and National both increased and then decreased during the 1981-2020 period. Drought was the most important agrometeorological disaster in the IMAR, and the covered and affected area was 64.10% and 62.45%, respectively, accounting the total covered and affected area of all kinds of disasters in 1981-2020. The grey correlation analysis showed that drought had the highest correlation with grain yield at the level of disaster covered and affected rate, and hail had the highest correlation with grain yield at the level of disaster destory rate. The disaster-yield assessment model constructed by this study was of high simulation accuracy, and the linear regression coefficients (R²) and the slop between the simulated and measured grain yield was 0.99 and 0.98, respectively (P < 0.01). The average relative simulation yield was 0.20% and relative simulation error of the following year grain yield was 2.49%. Grain yield loss rate due to disaster in the IMAR decreased (R²=0.77，P<0.01) from 1981 to 2020 with a rate of 0.48 percentage points·y-1, and average grain yield loss rate was 14.79% and there were 68.42% of years which grain yield loss rate above 10%. The disaster-yield assessment model of the IMAR formulated in this study can simulate and predict grain yield, and assess the loss of grain yield due to disasters, which can meet the needs of agrometeorological services. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Applied Entomology is the property of Chinese Journal of Applied Entomology, Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Sugarcane Cutting Quality (SCQ) has been one of the most important limiting factors in a sugarcane harvester. The sugarcane ratoons can be broken to reduce the budding rate, thus leading to the sugarcane yield decrease in the subsequent year. It is an extremely serious threat to the sugarcane yield for cost-saving planting. This study aims to investigate the effects of axial blade disk vibration and cutting parameters on the cutting quality of sugarcane harvesters. A series of cutting tests were performed on a self-developed test platform of a sugarcane harvester. The SCQ evaluating indexes were selected as the number of sugarcane cracks, the crack thickness, the crack depth, and the number of sugarcanes with broken ratoons. Then, the Comprehensive sugarcane Cutting Quality Evaluating Value (CCQEV) was calculated with the four parameters through the improved entropy as the test index. A regressive equation was established using single-factor tests, the orthogonal test, and the quadratic regressive orthogonal rotary combination test. The axial blade disk vibration was characterized by the vibration amplitude, frequency, and rotation velocity of the blade disk, together with the moving velocity of the sugarcane harvester, the blade installing angle, and their interactions on the SCQ. The results showed that there were strong linear negative relationships between the SCQ and the axial blade disk vibration amplitude, the SCQ and the axial blade disk vibration frequency. The significance coefficients of the axial blade disk vibration amplitude and frequency were 0.002 and 0.035, respectively. There were significant effects on the SCQ. By contrast, the significance coefficients of the sugarcane harvester moving velocity, the blade disk rotation velocity, and the blade disk installing angle were greater than 0.05, indicating no significant effect on the SCQ. The significance coefficients were 0.045 and 0.036 for the interaction of the axial blade disk vibration amplitude and frequency, as well as that of the axial blade disk vibration amplitude and the blade disk rotation velocity, respectively, indicating the significant effects on the SCQ. The significance coefficients of other interactions were greater than 0.05, indicating no significant effect on the SCQ. The significance levels were ranked in the descending order of the axial blade disk vibration amplitude > frequency > the sugarcane harvester moving velocity > the blade disk rotation velocity > the blade disk installing angle. There was a specific interaction between the axial blade disk vibration amplitude and frequency and that between the axial blade disk vibration amplitude and the blade disk rotation velocity. The greater the blade disk vibration amplitude and frequency were, the greater the CCQEV was, and the worse the SCQ was. The greater the blade disk vibration on axial amplitude and the blade disk rotation velocity were, the greater the CCQEV was, and the worse the SCQ was. Moreover, a high-speed camera was used to capture the sugarcane-cutting process. Several times of cutting rather than one time were implemented in the sugarcane harvester, due to the axial blade disk vibration. There was an outstanding height difference between the cut-in points. The significance levels of the axial blade disk vibration amplitude and frequency were higher than those of the rest. There was also some effect of the interaction between the axial blade disk vibration amplitude and frequency on the SCQ. Therefore, an analysis was made to clarify the influencing mechanisms of the axial blade disk vibration amplitude and frequency as well as their interaction with the SCQ from the angle of the multi-cutting process. The vibration amplitude of sugarcane harvesters decreased to improve the natural frequencies of the body frame, whereas, the cutting system of sugarcane harvesters increased to avoid the resonance phenomenon. This finding can provide a strong reference for the higher SCQ in sugarcane harvesters. [ABSTRACT FROM AUTHOR]

The experiment was to explore the effect of different planting methods on yield and quality of forage rape. In the experiment, three varieties of forage rapeseed (Shuangyou 1851, Fengyou 10 and Shuangyou 195) were selected and tested under three different planting methods (sowing and drilling with row spacing of 20.0 and 33.3 cm, respectively), to determine the number of leaves, stem diameter, chlorophyll index and nutritional quality at seedling stage. The results showed that three planting methods contributed to aboveground yield of forage rape: 20.0 cm drill > broadcast > 33.3 cm drill. Under the row spacing of 20.0 cm, three cultivars showed higher biomass yields at seedling and silique stages, and Shuangyou 1851 had the highest yield in both stages, reaching 49 522.25 and 76 633.72 kg/hm², respectively. Ash content of Shuangyou 1851 under three planting methods was significantly higher than that of Fengyou 10 and Shuangyou 195 (P<0.05). Ash content in 33.3 cm drill and broadcast was significantly higher than other varieties and planting methods (P<0.05). The EE content of Shuangyou 1851 under three planting methods was significantly lower than that of Fengyou 10 and Shuangyou 195 (P<0.05). The EE content of Fengyou 10 under 20.0 cm drill was significantly higher than that of the other two planting methods (P<0.05), and EE content of Shuangyou 195 under 33.3 cm drill was significantly lower than other varieties and planting methods (P<0.05). The content of NDF of Shuangyou 195 under 33.3 cm drilling was significantly higher than that of the other two planting methods (P<0.05), and the content of ADF under sowing conditions was significantly lower than the other two methods (P<0.05). The study indicates that the overall ash, EE and crude protein content of three cultivars were higher under the row spacing of 20.0 cm, the biomass of Shuangyou 1851 silique at initial stage of seeding at 20.0 cm reaches a maximum of 76 633.72 kg/hm², and the nutritional quality is higher. [ABSTRACT FROM AUTHOR]

Copyright of Food Research & Development is the property of Food Research & Development Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The study compared the production performance and feed quality of 8 silage maize varieties, to screen out silage maize varieties suitable for Chifeng area. In the experiment, the growth period, agronomic traits and yield were observed by random grouping, nutritional quality was comprehensively analyzed by membership function method, feeding quality of tested varieties was comprehensively evaluated by RFV and GI, and the main characteristics of each group were analyzed by clustering method. The main characteristics of each group were analyzed by cluster analysis. The results showed that the growth period of eight silage maize varieties was 115~127 d, and all of them could reach the wax ripening stage. Jinling silage 67, Jinling silage 37 and Beinong 208 had high production performance, with fresh grass yield reaching more than 90 t/hm² and hay yield reaching more than 29 t/hm². The top three varieties with feeding value are Dika 159, s1651 and Jinling 377. The correlation coefficient between fresh weight per plant and yield was 0.902. The study indicates that Jinling silage 67 is a special silage variety suitable for Chifeng area. Jinling silage 377 is suitable for both grain and feed in Chifeng area. S1651 and Dika 159 are better universal varieties for grain and feed. [ABSTRACT FROM AUTHOR]

【Objective】The combining ability[general combining ability（GCA） and special combining ability（SCA）]and genetic effects of main agronomic characters of CIMMYT maize inbred lines and Guangxi maize inbred lines were analyzed, so as to provide reference for utilization of tropical maize germplasm in Guangxi.【Method】Using 4 Guangxi backbone maize inbred lines（SP221,Xian 21 A,Gui 39722 and Guizhao 18421） as testers, the combining ability and genetic effect of 10 agronomic characters（plant height, ear length, ear diameter, row number, ear height, kernel row number, barren ear tip, 100-kernel weight, kernel ratio and yield per plant） of 24 tropical maize inbred lines（12 CIMMYT introduced lines and 12 Guangxi selected lines） were measured and analyzed to evaluate the utilization potential of their respective inbred lines by NCII genetic mating design.【Result】Among the 24 tropical maize inbred lines, DTMA-191 and QP103 showed excellent GCA of agronomic characters, and the hybrid combinations SP221×D13032,Xian 21 A×CML460 and Xian 21 A×D11231 showed excellent SCA of plant height, ear length, ear diameter, ear height, kernel row number, barren ear tip, 100-kernel weight, kernel ratio and yield per plant. Compared with the average GCA of 12 CIMMYT maize inbred lines, the 12 Guangxi inbred lines showed poor barren ear tip and better ear height and 100-kernel. Among the SCA of various agronomic characters of the combination, Guangxi maize inbred lines had obvious advantages in increasing yield per plant and inhibiting barren ear tip, and CIMMYT inbred lines had better performance in reducing ear height and increasing 100-kernel weight. The results of heritability analysis showed that the narrow heritability of ear height and barren ear tip were 54.01% and 52.46% respectively, and the narrow heritability of other characters were less than 50.00%.【Conclusion】Maize inbred lines DTMA-191 and QP103 main agronomic characters are excellent, therefore, they can be used as key inbred lines. Most agronomic characters of hybrid combination SP221×D13032,Xian 21 A×CML460 and Xian 21 A×D11231 are better, therefore, they can be used as testers in maize regional tests in the future. In breeding practice, Guangxi maize inbred lines are important for increasing yield per plant and improving barren ear tip, and CIMMYT maize inbred lines can be utilized for reducing ear height and increasing 100-kernel weight. In the process of tropical maize breeding, early generation selection should be carried out for ear height and barren tip, while late generation selection should be carried out for plant height, ear length, ear diameter, row number, kernel row number, 100-kernel weight, kernel ratio and yield per plant. [ABSTRACT FROM AUTHOR]

Field experiments were set up in four provinces including the winter wheat planting area of southern Huang-Huai in 2020 and 2021. Zhoumai 18, Zhoumai 36 and Aiminlanmai 1 were selected to reveal the effects of different meteorological factors on the yield and quality of three varieties. The results showed that the effects of different wheat variety characteristics and ecological environment on grain length, width, yield and quality reached a significant level in wheat. The effects of environmental conditions on grain length, plant height and yield were greater than those of variety genotypes, while the effects of variety genotypes on grain width, yield three elements, grain starch, protein and cellulose content were greater than those of environmental conditions. Analysis of meteorological factors from different experimental sites suggested that the performance of length and width of grain and weight 1000 grains were consistent. It showed that these two traits were positively regulated during heading to middle date of grain filling, and the negative regulation of temperature was found from jointing date to maturity date. Plant height was positively regulated by factors of moisture and temperature at jointing date. The yield and number of grains were positively regulated by moisture and temperature at heading date, and moisture at middle date of grain filling. The number of effective panicles was mainly positively regulated by the sunshine hours from jointing to heading date. Starch content of grain was positively regulated by temperature and moisture after jointing date, and negatively regulated by sunshine hours in the late flowering date. However, protein content of grain was negatively regulated by temperature and moisture after jointing date, and positively regulated by sunshine hours in the late flowering date. Cellulose was positively regulated by moisture from heading to mid date of grain filling. In conclusion, the characteristics of different wheat varieties and the ecological environment of the test site had significant effects on grain length, width, yield and quality in wheat. Great effects on wheat grain phenotype, yield and quality traits were observed in the analysis of average temperature, total water supply and total sunshine hours after jointing date. [ABSTRACT FROM AUTHOR]

[Objective] ‘Wuyunjing 8’ was mutated with ethyl methanesulfonate (EMS), and the root phenotypes and agronomic traits of M2 and M3 mutant population were analyzed and evaluated, in order to improve the understanding of the effect of root development on plant phenotype and crop yield, and provide support for further improvement and utilization of ‘Wuyunjing 8’. [Method] Based on the measurement and statistical analysis of 7-day seedling root phenotypes and its morphological indexes, plant phenotype and its agronomic, and yield characters of EMS mutant lines, the correlation analysis between main agronomic traits and yield characters was carried out, and cluster analysis and multidimensional preference analysis were performed on 14 mutant lines and their wild types. [Result] There were significant differences in root traits, plant height, number of effective tillers, panicle length and yield per plant among the mutant lines, and the variation coefficient of yield per plant and total number of seedling root tips were more than 20%. Correlation analysis showed that the yield per plant of mutant lines was positively correlated with the number of effective tillers, panicle length, the number of grains per panicle, 100-grain weight and the average root diameter of seedling. Cluster analysis showed that the mutant lines were divided into 5 groups. Group I contained W8 and 5 lines including RM6, group II contained 2 lines including RM4 and RM9, and group III contained 5 lines including RM1, while RM3 and RM13 were classified separately in one group. Finally, as relatively ideal breeding and experimental materials, six mutant lines were selected by multidimensional preference analysis. [Conclusion] EMS has a positive effect on plant height, panicle length, grain length, 100-grain weight, total root length and total number of seedling root tips. In addition, it is more likely to breed high-yield rice from mutant lines with thicker and shorter roots. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Irrigation & Drainage is the property of Journal of Irrigation & Drainage Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In the acid paddy soil in Xiangtan, Hunan Province, rhizosphere chamber culture experiments were conducted to explore the remediation effects of sepiolite on cadmium (Cd) -contaminated soil using different depth treatments of the cultivated soil. The aim was to investigate the effects of sepiolite application depth on Cd bioavailability in soil, plant Cd absorption, and rhizosphere environment. The results showed that, compared with the control without sepiolite, the pH value of rhizosphere and non-rhizosphere soil increased by 1.00~ 1.16 and 0.59~1.21 units using treatments at depths of 20, 10, and 5 cm; further, the available Cd content in the rhizosphere and five nonrhizosphere soil layers decreased by 0.02%~3.40% and 1.00%~7.80%, respectively. In addition, when the sepiolite application depth was 5 cm (T2), the available Cd content of the rhizosphere and non-rhizosphere soil showed the largest decreases of 3.40% and 7.80%, respectively. Moreover, the Cd content of each part of the rice decreased after sepiolite treatments were applied at different depths, and the Cd content of each part of the rice had the biggest drop when the sepiolite was applied to the soil at a depth of 5 cm, preventing the root from reaching the unpassivated soil (T4) . Furthermore, compared to the control, the Cd content of the root decreased significantly (P<0.05) . At the same time, the plant height and yield of rice increased with treatments at different depths; the biggest rise was with treatments of T2 and T4, with significant differences (P<0.05) . Overall, it could be seen that the application of sepiolite in shallow tillage (a treatment applied under the 5 cm plow layer) resulted in the best effect in reducing soil Cd bioavailability, and it also reduced the Cd content in rice and significantly increased rice yield. [ABSTRACT FROM AUTHOR]

[Objective] Analysis of ratoon ability and effects of planting densities on agronomic character of GTSS was conducted, so as to provide reference for new variety promotion. [ Method ] The 4-year variety comparison experiment for one-year plant crop and three-year ratoon and the planting density with the four treatments of75 000, 90000, 105 000 and 120 000 bud/hm2 were carried out( treatment 1-treatment 4), analyzed related agronomic characters and yield under different planting density and the ratoon ability of GTSS. [ Result ] The results of the 4 -year variety comparison experiment showed that there were no signifi cant differences in plant height and stem diameter between GTSS and ROC22 (CK) ( P > 0. OS, the same as below) . Millable stalks of GTSS was 6S 000 - 78 300 per hectare, significantly higher than that of CK ( 37 100 - 60 900 per hectare, P < 0. OS, the same as below) . The new planting cane yield of GTS5 was 96. 77 t/hm², slightly lower than that of CK( 98. 80 t/hm² ) and had not significant difference. The cane yield of GTSS in the 1st and 2nd year ratoon was more than 100 ti hm2,cane yield of 3th year ratoon reached 79. 43 t/hm²,and all cane yield of ratoon were signifi cantly higher than that of CK. The average cane yield of ratoon was 96. 71 t/hm², which increased 22. 48% compared with CK(78. 96 t/hm² ) . Smut incidence of GTSS was l. 8S% - 19. 44% by three years ratoon, that was obviously lower than CK( lS. 88% - 58. 62%) . The results of planting density showed that, there was no significant difference in sprouting rate and ratooning rate, and the same as the tillering rate which among four treatments of new planting or ratoon. Millable stalks of new planting and cane yield showed the trend of first up and then down with the increase of buds quantity. Millable stalks of new planting; Treatment 3 > treatment 4 > treatment 2 > treatment 1. Cane yield of new planting; treatment 3 > treatment 2 > treatment 4 > treatment l. Cane yield of ratoon increased with the increase of millable stalks. Millable stalks of ratoon and cane yield of ratoon: Treatment 3 >treatment 1 >treatment 4 >treatment 2. In treatment 3, the cane yield of new planting and ratoon was the highest, and the uniformity of plant height and stalk diameter was the best in ratoon. Smut incidence was 0 - l. 43 %, that was not closely related with planting density. Sucrose content of new planting; treatment 2 > treatment 3 > treatment 1 > treatment 4, sucrose content of ratoon: Treatment 2 > treatment 1 > treatment 3 > treatment 4. Suitable planting density could be increased the sucrose content of GT55, but too high planting density could affect the sucrose cumulative. [ Conclusion] GT55 grows quickly in the early stage and more tillering stalks grow up, obtains more millable cane, and with highly stable cane yield, lower smut incidence, and strong ratooning ability. Recommend planting quantity of GT55 is 105 000 buds per hectare which should be according to local conditions and the cultivation conditions. [ABSTRACT FROM AUTHOR]

The experiment was to improve the yield and quality of forage, different creeping forage soybean and silage corn were planted in the same line and strip, the yield and nutritional indexes of mixed forage grass were measured, and the forage soybean seed quality with the best comprehensive characters and the corresponding cultivation mode were selected through cluster and principal component analysis. The results showed that the yield, crude protein content, dry matter digestibility, dry matter intake and relative feed value of mixed forage were significantly higher than those of silage corn (P<0.05). The mixed forage was divided into three groups through systematic clustering. The first group included the mixed forage planted by FML10 and silage corn in the same line and strip, and the mixed forage planted by FML2 and silage corn in the same line. These three forages were high-yield and high relative forage value. The mixed forage of FML10 and silage corn was the first in the comprehensive evaluation score of principal components. The study indicates FML10 silage corn strip compound planting is a suitable planting mode in Ningxia Yellow River Diversion Irrigation area. [ABSTRACT FROM AUTHOR]

‘Baoshi No.1', ‘Wanxiang' and ‘Fuwan No. 8' are the new longan varieties(lines)introduced from Fruit Research Institute of Fujian Academy of Agricultural Sciences to Nanning City, Guangxi in 2017. In order to study the local growth and development, flowering and fruiting regularity ‘Shixia' and ‘Guiming No.1', the main cultivars in Guangxi, were used as control to study the growth and development, yield, phenological period, flowering and fruit dropping regularity, and the relationship between the number of female flowers and temperature and humidity. The results were as follows: The plant growth and yield of the three introduced longan varieties(lines)after high grafting were similar to those of ‘Shixia'. The single panicle of ‘Baoshi No.1' was the heaviest, followed by ‘Fuwan No.8', and ‘Wanxiang' was similar to that of the two main cultivars; the fruit maturity stage of ‘Fuwan No.8' was the latest and the longest growth stage was 196 d, which was 15 d longer than ‘Guiming No.1'. The flowering stage of ‘Baoshi No.1' was the longest and ‘Wanxiang' was the shortest. The order of male and female flowers blooming of the three new varieties(lines)was “male-female-male-female-male”. The meeting time of male and female flowers of ‘Baoshi No.1' and ‘Fuwan No.8' was longer, which was 18-19 d. The three new longan varieties(lines)had three peak stages of fruit dropping in Nanning, and the fruit dropping mainly occurred in the second physiological fruit dropping stage in June. The results showed that the numbers of female flowers of three new longan varieties(lines)were closely related to the temperature and humidity before flowering. Within a certain range of temperature and humidity before and after flowering, higher temperature and lower air humidity were beneficial to female flower blooming of ‘Baoshi No.1' and ‘Fuwan No.8', while lower temperature and higher air humidity were beneficial to female flower blooming of ‘Wanxiang'. On the whole, the three introduced Fujian longan varieties(lines)can normally bloom and bear fruit in Guangxi, ‘Baoshi No.1' is earlier, ‘Fuwan No.8' is the latest, the meeting time of male and female flowers is long, and the fruit-dropping rate is low. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objective] The present study aimed to clarify the growth, material accumulation and distribution, and nutrient utilization efficiency of flue-cured tobacco in tobacco-rice rotation fields for Hunan. [ Method] The dynamic changes of root system, above ground agronomic characters, dry matter, nitrogen, phosphorus, potassium and nicotine accumulation and distribution, as well as the utilization efficiency of nitrogen, phosphorus and potassium in three types of tobacco-rice rotation fields were studied by using typical case investigation method. [Result] Tobacco plants in high yield fields had developed root system, large quantity, large absorption surface area, thick stem, large leaf area, and more accumulation of dry matter, nitrogen, phosphorus and potassium. 90 days after transplanting, the total dry matter, nitrogen, phosphorus, potassium and nicotine accumulation in high yield fields were 35. 08%, 33. 84%, 18. 18%, 28. 03% and 25. 24% higher than those in suitable yield fields, and 70. 4 1 %, 44. 51 %, 63. 53 %, 59. 94 % and 21. 81 % higher than those in safeguarding yield field, respectively. The harvest index of nitrogen, phosphorus and potassium were higher in suitable yield fields. [Conclusion ] The suitable soil types should be selected for tobacco production. Straw should be full returned to the field to improve soil organic matter. Early winter ploughing should be carried out to promote soil ripening. Attention should be paid to the cultivation of soil to improve soil aeration and soil temperature, so as to promote early growth and rapid development of flue-cured tobacco. [ABSTRACT FROM AUTHOR]

Copyright of Acta Agriculturae Zhejiangensis is the property of Acta Agriculturae Zhejiangensis Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

[Objectives]The paper aimed to reveal the effects of continuous positioning of different nitrogen application levels on photosynthetic characteristics and yield of cotton. [Methods]In 2018, fixed-point field trials of 6 treatments with different nitrogen levels of 0, 90, 180, 270, 360, 450 kg·hm-2 were set up, and each treatment was represented by N0, N90, N180, N270, N360, and N450, respectively. Repeated experiments were carried out on the original position of each treatment in 2018 for two consecutive years of 2019 and 2020. The photosynthetic characteristics and yield of cotton under different nitrogen application levels were measured and their changing rules were studied. [Results]The treatment of average leaf area index(LAI)from large to small was N270, N450, N360, N180, N90, N0 during the whole growth period in 2019 and 2020. The relative chlorophyll content(SPAD), net photosynthetic rate(Pn), transpiration rate(Tr), and stomatal conductance(Gs)showed a parabolic change trend that first increased and then decreased with the increase of nitrogen application rate. All treatments with medium nitrogen(N270)were the highest, while the intercellular CO2 concentration(Ci)was the lowest. In addition, the differences of LAI、SPAD, Pn, Tr and Gs of each treatment in the positioning three years(2020)were higher than those in the positioning two years(2019). The output of each year from 2018 to 2020 showed a single peak curve of first increasing and then decreasing with the increase of nitrogen application level, and basically number of bolls per plant and the yield under the treatment of medium nitrogen N270 were the highest. The yields of N270 treatments for two and three consecutive years of nitrogen application were significantly higher than those of no fertilizer(N0), low nitrogen(N90, N180), and high nitrogen(N360, N450)treatments. The longer the positioning period, the more significant the performance would be, In 2019 the output of N270 treatment respectively increased by 17.10%, 5.11%, 3.83%, 3.83%, 5.16% compared with N0, N90, N180, N360, N450 treatments, and in 2020 it respectively increased by 41.40%, 18.30%, 8.12%, 9.08% and 8.44%. [Conclusions]The photosynthesis of cotton without continuous nitrogen application was the worst, causing serious yield reduction. Low nitrogen of 90 and 180 kg·hm-2 did not significantly increase photosynthesis, and the increase in yield was smaller. Under the conditions of high nitrogen content of 360 and 450 kg·hm-2, the continuous positioning time was the longer, the inhibition on cotton photosynthesis was the stronger, and the cotton yield was the smaller. This experiment showed that when the continuous nitrogen application rate was 270 kg·hm-2, the photosynthesis capacity of cotton was the highest, and the cotton yield could be maintained at a high level. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Oil Crop Sciences is the property of Oil Crops Research Institute of Chinese Academy of Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Henan Agricultural Sciences is the property of Editorial Board of Journal of Henan Agricultural Sciences and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Agricultural Science & Technology (1008-0864) is the property of Journal of Agricultural Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

‘Guiduoku 75' bred by distant hybridization was selected to investigate the major agronomic traits, yield traits and quality traits in ratooning plants under the 40 cm(I), 20 cm(Ⅱ)and 10 cm(Ⅲ)of stubble height treatment. The results indicated that the plant height, shoot weight, grain number per plant, yield per plant and yield in ratooning plants were significantly altered by stubble height when stubble height was less than 40 cm. The values of plant height, shoot weight, grain number per plant, yield per plant and yield in ratooning plants under treatment I were significant or extremely significant higher than those of treatments Ⅱ and Ⅲ, suggesting that higher stubble height is beneficial for vegetative organ growth and yield formation in ratooning plants. ‘Guiduoku 75' seeds contained four protein components as albumine content > gluten content > prolamine content > globulin content. The total protein content and gluten content were significantly altered by stubble height, but the albumin content, prolamine content, globulin content were not when stubble height was less than 40 cm. The total flavonoid content in ratooning plants of ‘Guiduoku 75' ranged from 3.17% to 3.33%, that was little affected by stubble height. The ratooning plants of ‘Guiduoku 75' under 40 cm of stubble height treatment harvested 1.5 t·hm-2 seeds that contained 4.06% of albumin content, 3.26% of gluten content, 1.27% of prolamine content, 0.39% of globulin content and 3.33% of total flavonoid content, exhibiting high nutritional value and medicinal value. [ABSTRACT FROM AUTHOR]