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Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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.)

[Objective] The effects of deep ploughing on soil characteristics and maize yield of red soil sloping land,and the suitable subsoiling depth and operation measures were selected to provide a basis for the rational construction of red soil sloping land. [MethodsJin this study, four different tillage treatments including conventional rotary tillage 20 cm (CK) , no-tillage (SO) , subsoiling 30 cm (S30) and subsoiling 40 cm (S40) were set up. The planting methods was sowing maize with identical field management and fertilization methods. [ ResultsjThe results showed that treatments SO, S30 and S40 had no significant died on maize yield, but in the first year, the biological yield increased significantly by 11.66 % , 14.69 % and 5. 07 % , respectively. In the second year, the yield increased by 3. 22 % ,22. 03 % and 14. 14 % , respectively. The biological yield increased —1.81 % , 15.61 % , 5. 27 % , respectively; In the third year, the yield of corn increased by 28.71 % , 22.00 % and5.69 % , respectively, the biological yield increased by 16.86 % , 14.86 % and 3.76 % , respectively. In the 0-20 cm soil layer, with SO treatment, soil bulk density decreased by 2. 83 % in three years, soil compaction increased by 33.20 % , soil water content decreased by 5.73 % ; with S30 treatment, soil bulk density and soil compaction reduced by 3. 88 % and 3.95, respectively, soil water content increased by 5.44 % ; with S40 treatment, soil bulk density decreased by 0. 52 % , soil compaction increased by 7.70 %. In the 20 -40 cm soil layer, with SO treatment, soil bulk density decreased by 3. 41 %, the soil compaction increased by 7. 54 % , the soil water content increased by 6.21 % ; with S30 treatment, soil bulk density decreased by 9. 23 % , llie soil compaction decreased by 20. 27 % , and llie soil water content increased by 13. 80 % ; with S40 treatment, soil weight loss decreased by 8.79 % , soil compaction decreased by 15. 38 % , and soil water content increased by 7.99 %. In ihe 40 -60 cm soil layer, with SO treatment, soil bulk density decreased bv 3. 17 % , soil compaction increased by 35.53 % , soil water content increased by 2. 86 % ; with S30 treatment, soil bulk density decreased by 1.48 % , soil compaction increased by 21.93 % , soil water content increased by 3. 00 % ; with S40 treatment, soil weight loss decreased by 4. 86 % , soil compaction decreased by 2. 84 % , soil water content increased by 7. 84 %. [Conclusion] Deep ploughing was a suitable tillage measure that could promote the yield of maize on the slope of red soil in Yunnan Province, and the suitable depth of subsoiling was 30 cm in this experimental area. [ABSTRACT FROM AUTHOR]

[Objective] A long-term positioning experiment of no-tillage organic fertilization was carried out to investigate the effects of conservation tillage on soil quality and crop yield in the typical red soil sloping cropland in central Yunnan Province. [Method] In this study, notillage without organic fertilization treatment (NA) was used as a control experiment, and long-term positioning experiment of no-tillage organic fertilization (NE) was set up, and the effects of NE on soil quality and crop yield were studied from 2015 to 2018. [Result] The results showed that the field moisture capacity increased by 10.26% and 9.46%, and the water content of soil increased by 6. 32% and 9.11% in NE treatment in the depth of 0-20 cm and 20-40 cm, respectively. The soil pH in the three soil layeis of 0-20 cm, 20-40 cm and 40-60 cm increased by 10.80%, 7.19% and 3. 54%, the organic matter increased by 18.47%, 23.02% and 30.86%, the soil total nitrogen increased by 11.28% ,17.86% and 16.22%, the soil available nitrogen increased by 7.33%, 16.21% and 7.36%, respectively. The bacterial abundance of Pmteobacteria, Ac ido bacteria and Gemmatimonadetes increased by 23.65%, 39.72% and 42.08%, and the abundance of Chlorojlexi and Adinobacteria was reduced by 53.03% and 49.15%, respectively. The biomass of com stalks in-creased by 10.86% and the yield of com increased by 20.09%. [Conclusion] No-tillage organic fertilization is an effective measure to realize the rational tillage construction of red soil sloping cropland, which can improve soil quality,crop yield and bacterial population structure. [ABSTRACT FROM AUTHOR]

[Objective]The fermentation medium and fermentation conditions of Streptomyces malaysiensis ECO 00002 strain were optimized to improve the yield of Azalomycin F and lay the foundation for its industrial development. [Method] At the shaking flask level, Plackett-Bur-man (PB) test was used to investigate the effects of six factors including glucose, starch, yeast extract, soy flour, NaCl, and K2HP04 on the yield of Azalomycin F. The maximum response value of each factor was determined by Response Surface Analysis (RSA) test. The suitable initial pH, fermentation liquid volume, inoculum volume, fermentation temperature, fermentation time were screened by gradient test. The optimization conditions were verified in a 50 L automatic fermentation tank by amplification application test. [Result] The results showed that the main influencing factors in the fermentation medium were soybean flour and glucose, and the maximum response values were 2.90% and 1.59 %, respectively. The fermentation conditions were optimized as follows; initial pH 7. 5, liquid volume 100 mL/500 mL, inoculum volume 10%, fermentation temperature 28°C, fermentation time 72 hours. [Conclusion] The titer of Azamycin F increased from 637. 59 μg/mL to 1950. 26 μg/mL under the optimized fermentation medium and fermentation conditions, and the HPLC titer increasing rate was 205.88 % (P <0.01). The titer of Azamycin F was 2094. 12 μg/niL in 50 L fermentation tank, and the optimization effect was remarkable. [ABSTRACT FROM AUTHOR]

【Objective】 In order to increase the biomass of the strain S. malaysiensis ECO-00002, the seed medium composition and culture conditions were optimized. 【Method】 The Plackett-Burman test was used to screen the carbon and nitrogen sources for seed culture medium, and the Response Surface Analysis test was used to identify the most significant factors and to determine their optimal values. Furthermore, the proportion of multivitamins, complex salts, and CaCO3 were determined. The initial pH of the medium and liquid volume were optimized by comparative tests. 【Result】 The optimization results showed that the growth of the strain seed mainly affected by the carbon source which were glucose, yeast extract and malt extract, and the maximum response values of the three factors were 1.45 %, 1.50 %, 2.00 %, respectively. The inorganic salt was as follows: CaCO3 3.00 g/L, MgSO4·7 H20 1.00 g/L, MnSO4·4 H20 0.10 g/L, KH2PO4 0.20 g/L. Initial pH was 7.50, and liquid volume was 100 mL/500 mL. The optimization of culture conditions was as following: culture temperature was 28 °C, and incubation time was 200 r/min with shaking culture 40 hours. 【Conclusion】 Under the optimized seed culture conditions, the biomass yield increased from 4.09 g to 8.91 g, and the increase rate was 117.70 %. The optimization effect was significant. [ABSTRACT FROM AUTHOR]

Copyright of Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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 Southwest China Journal of Agricultural Sciences is the property of Editorial Department of Southwest China Journal 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.)

A pot experiment was conducted to study growth, nutrient accumulation and utilization efficiency of Chuannong 16(CN16) and Chuanmai 42(CM42) , which were two typical cultivar wheat in Sichuan, under nitrogen ( N) , phosphorus (P) and potassium(K) stresses. Effective tillers, grain yield and nutrient accumulation of CN16 and CM42 were significantly reduced under N, P and K stresses, and were affected the most significantly under N stress, followed by P stress, then K stress. N, P and K stress increased plant height of CN16 and CM42 , which was the most obvious under P stress. The differences of nutrient accumulation between CN16 and CM42 were significant under different treatments. N and P were mainly accumulated in grain, and N distribution ratio in grain was from 67.64 % to 77. 30 % , P distribution ratio in grain was from 59. 05 % to 69.41 % , P distribution ratio in spike was from S4.73 % to 92.46 % . K were mainly accumulated in the stem, the allocation ratio was from 46. 87 % to 55. 72 % . The use efficiency of N and K were increased under N stress , and P use efficiency was reduced- N and P use efficiency and harvest index were increased under P stress. K harvest index was increased under K stress, N and P use efficiency were reduced- The differences of growth, nutrient accumulation, nutrient distribution and nutrient use efficiency between CN16 and CM42 were obvious under N, P and K stress. The maximum tillers and maximum tillers of CN16 were more than CM42 under the four different treatments , while spike length, grain weight per spike, kernels number per spike, 1000-grain weight, root weight, stem weight, leaf weight and spike weight per tiller of CM42 were higher than CN16. N, P and K accumulation in root, stem, leaf, spike and grain per tiller of CM42 were higher than CN16. In the same time, nutrient distribution ratio in grain of CM42 was higher than CN16 , and nutrient use efficiency of CM42 was higher than CN16 under N, P and K stress. Therefore, N, P and K stresses significantly influenced growth, spike number, spike weight under N, P and K stress , which were controlled by gene. The agronomic traits, nutrient accumulation, nutrient allocation and nutrient utilization of CM42 were better than CN16 under N, P and K stresses. [ABSTRACT FROM AUTHOR]

Abandon and burning were still the main ways to dispose Enoki mushroom residue, in order to explore the effect of the two processing methods on the environment, the residues from Honguan county in Aba were used as research objects, the heavy metal content of abandoned Enoki mushroom residue were investigated by FTIR spectroscopy, GC-MS and other methods, and their leaching liquid and the combustion exhaust gas were analyzed. The results showed that the abandoned Enoki mushroom residue were general solid waste, and the combustion exhaust gas of the residue had a little effect on indoor air, which would not cause harm to the local environmental air quality. [ABSTRACT FROM AUTHOR]

In order to clarify nodule and root growth of Vicia villosa in the purple hilly area of Sichuan under different fertilizer treatments, the field experiment was conducted. The eight different fertilizer treatments were designed, and their root system and nodule growth were studied. The results showed that the difference of V. villosa root length, root dry weight, nodule number, nodule fresh weight is significant in the purple hilly area of Sichuan under the eight different fertilizer treatments. Phosphor, potassium and microelement fertilizer could significantly promote the growth of root and nodule. The root length, root dry weight, nodule number and nodule fresh weight of Vicia villosa under no nitrogen application were improved during its early growth stage and moderate nitrogenous fertilizer was an essential way to be supplemented during its middle and later growth stage. At the same time, the correlation and path analysis showed that the root dry weight was most correlated with dry weight of individual plant, and the correlation coefficient was 0.93, the path coefficient was 0.7220. Therefore, phosphorus and potassium fertilizer are very important to the growth of Vicia vilosa . And moderate nitrogenous fertilizer may be used to improve the growth of root and nodule, which can increase fertilizer use efficiency. [ABSTRACT FROM AUTHOR]