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In order to explore the hotspots and research trends of domestic research on biochar in tobacco agriculture in recent years, bibliometric methods were used to analyze papers about biochar application in tobacco planting research included in the China National Knowledge Infrastructure (CNKI). The numbers, annual distribution, author information, publications and research content were statistically analyzed, and the CiteSpace V visualization software was used to predict and analyze research hotspots. The results showed that a total of 114 journal papers and 81 dissertations on the application of biochar to tobacco planting were retrieved, including 8 doctoral dissertations and 73 master’ s dissertations. The institution with the most research in China was Henan Agricultural University, and Liu Guoshun was the scholar with the most published papers. Domestic research on tobacco biochar still lacked a stable core author group, and the number of core authors was small. Tobacco biochar application hotspots focused on tobacco quality, chemical composition and tobacco-growing soil. In recent years, research hotspots tended to be on the effects of biochar on soil microbial communities and heavy metals in tobacco leaves. [ABSTRACT FROM AUTHOR]

Field experiments were conducted to study the residue and degradation dynamics of atrazine in typical yellow soil tobacco fields in Guizhou Province,the occurrence of tobacco pesticide damage and the threshold and safety interval of tobacco damage was elucidated. The effects of soil environmental factors on the half-life of atrazine was analyzed. The results showed that atrazine inhibited the growth of tobacco significantly, which showed that the leaves were small, serious deformity, the old leaf tip vein began to yellow. The inhibition rates of plant height and leaf area were significantly positively correlated with atrazine dosage. The inhibition rates of plant height and leaf area increased with the increase of atrazine dosage. The degradation half-life of atrazine in typical yellow soil was 8. 45-11. 95 d, and the safe isolation period in the field should be longer than 48. 6 d. The degradation half-life of atrazine was significantly positively correlated with the content of soil organic matter, there was significant negative correlation with pH and available potassium, but no significant correlation with available phosphorus and available nitrogen. The results had great significance to the scientific application of herbicides and tobacco safety in the sorghum/ maizetobacco rotation area of yellow soil. [ABSTRACT FROM AUTHOR]

In this study, the treatments with 2-pin shading net covering the potato, without shading net as the control were designed. The effect of different shading treatments on growing, yield and nutritional quality of ‘Qingshu9' was researched. It turned out that height, internode length, leaf area increased obviously compared with the control treatment after shaded, stem diameter decreased compared with the control treatment, main stem number, and pitch number had no significant difference compared with the control treatment. And the shading treatment had a serious effect on tuber yield. Under the 70. 22 % shading, the commodity rate, weight of individual plant, yield decreased remarkably compared with the control which could reduce 87. 08 % production,other shade treatments that the shading over the 80 % was never produced. Therefore the shading 70 % was used as the selection pressure for another 9 potato varieties of shade-tolerant evaluation. The results indicated that the reduction in yield were significant fearfully in all varieties of potato. The reduction rate of yield range between 62. 14 % and 90. 74 %. There were obvious differences between varieties of shade-tolerance. The variety of ‘Zhongshu20 'was the most shade-tolerant,the second shade-tolerance varieties were the ‘Woff', ‘Qingshu9', ‘Favorite', and the least shade-tolerant variety was the ‘Hezuo88'. From the point of tuber quality influence, dry matter and starch content all decreased, however, the vast majority of potato cultivars protein content increased after shading treatment. [ABSTRACT FROM AUTHOR]

In order to establish the abundance-deficiency indices of soil nitrogen, phosphorus, potassium for tobacco planting soils in Guizhou Province, the correlation between the content of available nitrogen, phosphorus, and potassium nutrients in soil and the relative yield of tobacco leaves was analyzed based on fertilizing experiments we performed in Zunyi, Bijie and Qiandongnan. Based on the criteria that the relative yield of tobacco leaves was ≥95%, 85%-<95%, 65%-<85%, 50%-<65%, and <50% in the nutrient deficient plots, the corresponding soil available nutrients were divided into five grades, namely, extremely high, high, medium, low, and extremely low. The results showed that the average values of available nitrogen, available phosphorus, and available potassium were 122.66, 32.52, and 347.25 mg/kg, respectively. The average relative yields of tobacco leaves under nitrogen, phosphorus, and potassium deficiency treatments were 84.00%, 91.97%, and 101.00%, respectively. According to the calculation of the relationship equation, the indexes of alkali-hydrolyzable nitrogen in the extremely high, high, medium, low, and very low fertility grades of tobacco planting soils in Guizhou are ≥ 134.9, 123.8-<134.9, 101.5-<123.8, 84.8-<101.5, and <84.8 mg/kg, the indexes of available phosphorus are ≥34.5, 28.0-<34.5, 14.9-<28.0, 5.1-<14.9, and <5.1 mg/kg, and the indexes of available potassium are ≥324.0, 285.3-<324.0, 207.8-<285.3, 149.6-<207.8, and<149.6 mg/kg, respectively. It would provide reference and guidance for rational fertilization in Guizhou tobacco planting areas. [ABSTRACT FROM AUTHOR]

[Objective] The present paper aimed to explore the metabolic differences between the local flue-cured tobacco variety Jiucaiping 2 selected by the Bijie Tobacco Company and the control variety Yunyan 87 planted in the Bijie area, lay the foundation for further revealing the molecular mechanism of the aroma style characteristics of Jiucaiping 2 tobacco leaves, and provide theoretical basis for the promotion and application of this variety. [Method]Taking Yunyan 87 as the reference material, the metabolome analysis of Yunyau 87 and Jiucaiping 2 fresh tobacco leaves from three tobacco leaf production areas ( Dayi, Kele, Tiejiaug) in Hezhaug county, Bijie city was carried out by liquid chromatography-mass spectrometry. [ Result] A total of 1880 peaks were detected in the tobacco samples, and principal component analysis showed significant metabolic differences between Jiucaiping 2 and Yunyan 87 in three tobacco producing regions. Metabolite difference analysis was performed with difference multiple greater than 2 and the P < 0. 05 oft-test as the standard. The order of ion quantity differences among different production areas was Dayi > Kele > Tiejiaug. At the same time, it was identified that 46 ion peaks had au increased accumulation in Jiucaiping 2 from three production areas, while 49 ion peaks had a decreased accumulation in Jiucaiping 2 from three production areas. A flavonoid metabolite M_9637[luteolin 7-(6'-malonylglucoside) ]was further identified among the peaks with increased accumulation in Jiucaiping 2. Widely-targeted metabolic analysis of phenolic acids and flavonoids in two tobacco varieties revealed an increasing trend of accumulation of two types of flavonoids (isorhamnetin and quercetin) in Jiucaiping 2. The analysis of nomicotine and nicotine showed that both metabolites tended to accumulate and decrease in Jiucaiping 2. [Conclusion] In the study, the comparative analysis of the metabolites of Jiucaiping 2 and Yunyan 87 in three tobacco producing areas found that the metabolism of flavonoids in Jiucaiping 2 was higher than that of Yunyan 87, and the metabolism of nicotine was lower than that of Yunyau 87. The differences in the accumulation of the above two types of substances may be the basis for the formation of the aroma style characteristics of Jiucaiping 2 tobacco leaves. [ABSTRACT FROM AUTHOR]