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Wang X.,Hunan Agricultural University | Zhou J.,Hunan Agricultural University | Li Q.,Hunan Agricultural University | Liu X.,Hunan Agricultural University | And 3 more authors.
Tobacco Science and Technology | Year: 2013

The nutrient contents in 1778 soil samples from main tobacco growing areas in 96 towns of 9 counties of Qujing City in Yunnan Province were analyzed, and their relationships with altitude were investigated. The results showed that Qujing tobacco growing areas were mainly at the altitude from 1300 to 2400 m, the average altitude was 1929.03±168.78 m. The altitude extremely significantly positively correlated to the contents of organic matter, available manganese, available boron and available sulfur in soil, significantly positively correlated to alkali-hydrolyzable nitrogen content, and extremely significantly negatively correlated to pH, and the contents of total phosphorus, total potassium, readily-available phosphorus, readily-available potassium, available calcium and available magnesium; while its relationship with total nitrogen content was not significant. The top three soil nutrients in the order of correlation with altitude were pH, alkali-hydrolyzable nitrogen and total nitrogen contents. With the ascent of altitude, the contents of available manganese, available boron and available sulfur in soil increased gradually, while soil pH and the contents of readily-available phosphorus, readily-available potassium and available magnesium in soil reduced gradually. Source


Li Q.,Hunan University | Zhang Y.,Hunan University | Chen L.,Hunan University | Peng K.,China Tobacco Chuanyu Industrial Co. | And 3 more authors.
Tobacco Science and Technology | Year: 2015

By GPS positioning, 341 tobacco planting soil samples were collected from Luliang County in Yunnan Province. The fractal dimensionality, D value, of soil particle mass in plow layer was calculated with the fractal model of soil particle mass, the general characteristics, distribution, and its relationships with the texture, particle distribution and nutrients of soil were analyzed. The results indicated that D values ranged from 2.524 to 2.928 with the mean value of 2.823; soil types in the order of D value were light clay > heavy loam > medium loam > light loam; D value extremely significantly positively correlated to the mass percentage of clay particle (diameter < 0.002 mm) in soil, while extremely significantly negatively correlated to the percentages of sand particle (diameter > 0.050 mm) and silt particle (diameter from 0.002 to 0.050 mm) in soil, as the percentage of clay particle increased by 10%, D values increased by 0.05 units; as the percentage of silt or sand particle increased by 10%, D value decreased by 0.09 or 0.06 units, respectively. D value of soil particle mass can directly reflect the constitution of soil particles to a certain extent. D value extremely significantly positively correlated to the contents of organic matter, total N, total K, total P, alkali-hydrolyzable N and available K, while extremely significantly negatively correlated to the content of available P in soil. The fractal dimensionality of soil particle mass can be used to characterize the nutrient status of soil. ©, 2015, Editorial Office of Tobacco Science and Technology. All right reserved. Source


Wang Y.,Hunan Agricultural University | Zhou J.,Hunan Agricultural University | Li Q.,Hunan Agricultural University | Zhang Y.,Hunan Agricultural University | And 3 more authors.
Tobacco Science and Technology | Year: 2014

The usability index (CCUI value), which represents the quality of tobacco leaves on the basis of chemical components in tobacco leaves was calculated with fuzzy mathematics and principal component analysis method to comprehensively evaluate the usability of Qujing tobacco leaves on the basis of their chemical compositions, and the influences of chemical components on sensory quality were analyzed. The results showed that: 1) The contents of nicotine, potassium and chlorine, and the ratio of nitrogen to nicotine in Qujing tobacco leaves were moderate, while the contents of total sugar and reducing sugar, and the ratios of potassium to chlorine and sugar to nicotine were higher, the contents of total nitrogen and starch were slightly lower. 2) Chlorine content did not differ significantly between grades, total nitrogen content did not differ significantly between varieties and the ratio of nitrogen to nicotine did not differ significantly between varieties or growing areas. The other chemical components differed significantly or extremely significantly between grades, varieties or growing areas. The order of usability among grades was C3F〈B2F〈X2F, among varieties was K326〈Hongda〈Zhongyan 100〈Yunyan 85〈Yunyan 97〈Yunyan 87〈NC102〈NC297, among growing areas was Shizong County〈Luoping County〈Qilin District〈Luliang County〈Xuanwei City〈Zhanyi County〈Huize County〈Malong County. 3) The grey incidence analysis indicated that the chemical components in Qujing tobacco leaves mainly affected ash color, combustibility, impact and aroma quality in sensory evaluation. ©, 2014, Editorial Office of Tobacco Science and Technology. All right reserved. Source


Li Q.,Hunan Agricultural University | Zhou J.,Hunan Agricultural University | Zhang Y.,China Tobacco Fujian Industrial Co. | Wu L.,Qujing Branch of Yunnan Provincial Tobacco Company | And 4 more authors.
Tobacco Science and Technology | Year: 2013

In order to investigate the spatial distribution and influencing factors of available microelements in tobacco growing soil, 2088 soil samples were collected from Qujing tobacco growing areas by adopting GPS technology, the general characteristics and spatial variability of available microelements in the soil samples were analyzed, and the spatial distribution of available microelements was mapped with ordinary Kriging interpolation. The factors affecting available microelements were also studied. The results indicated that all the available microelements were of moderate variability and distributed anisotropically. The spatial variance of available B was mainly affected by random factors, while that of other available microelements was affected by both structural and random factors. Available B was extremely deficient throughout Qujing, the areas with very low (<0.25 mg/kg) and low (0.25-0.50 mg/kg) available B accounted for 7.74% and 68.20%, respectively; available Zn was above moderate, the areas with low (<1.5 mg/kg) available Zn only accounted for 1.32%; the contents of available Cu, available Fe and available Mn were very rich; the contents of available Mo presented large regional differences, the areas lacking of available Mo accounted for 28.38%. Altitude, soil type, soil pH, organic fertilizer input and preceding crop were main factors affecting the available microelements in tobacco growing soil. Source

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