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《Guizhou Agricultural Sciences》 2006-06
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Comprehensive Evaluation on Purple Soil Fertility of Tobacco Planting Areas in Guizhou

WANG Hui~(1),DING Wei~(2),XU Zi-cheng~(1),ZHANG Yan-jun~(1)(1.Agricultural Collage,Henan Agricultural University,Zhengzhou 450002;2.Guizhou Tobacco Company,Guiyang 550003,China)  
Ten nutrient indexes of 55 purple soil samples were used to analyze the principal components.Six principal components were picked up according to over 85% of the contribution rate to calculate the scores of principal components of each soil sample,and then the scores were analyzed by the cluster method.The tested soil samples could be divided into 4 grades including higher(Ⅰ),high(Ⅱ),medium(Ⅲ) and low(Ⅳ),which took up 12.7%,29.1%,36.4% and 21.8% of the total soil samples respectively.The total score of grade Ⅰ with the highest contents of soil nutrients was ≥ 0.5323.The total score of grade Ⅱ without the significant difference from that of grade Ⅰ except contents of organic matter and CEC was 0.0631~0.3845.The total score of grade Ⅲ with medium contents of soil nutrients except available P being significantly lower than that of grade Ⅱ was-0.2349~0.0056.The total score of grade Ⅳ with the lowest contents of soil nutrients was ≤(-0.3003).
【Fund】: 国家烟草专卖局重点科技攻关项目(110200401017);; 河南省杰出人才创新基金项目(0421001900)
【CateGory Index】: S158
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