Soil Fertility Level and Comprehensive Evaluation of Tobacco Planting in Yuexi County
This paper aims to clarify the current status of soil nutrients in tobacco-planting soils in Yuexi County,Liangshan Prefecture.127 soil samples were collected from 11 tobacco-planting townships in Yuexi County.Fuzzy mathematical method and principal component analysis were used to comprehensively evaluate soil pH,organic matter,alkaline dissolved nitrogen(ADN),quick-acting phosphorus(QAP),quick-acting potassium(QAPK),effec-tive sulphur(ES),effective zinc(Zn),exchangeable calcium(ECC),and exchangeable magnesium(Mg)content in Yuexi's main tobacco-planting areas.The soil fertility suitability index(SFI)of Yuexi County is computed.The soil fertility grade of tobacco planting in all townships of Yuexi County was above grade Ⅲ,and the comprehen-sive fertility SFI index was 0.74,with moderate fertility.Among them,SFI is specifically expressed as Banqiao＞Xinmin＞Dahua＞Zhongsuo＞Yuecheng＞Darui＞Gongmo＞Puxiong＞Nanjing＞Bao'an＞Shugu.However,some areas have low pH levels,and the fertilization programme as a whole should be adjusted according to the actual local conditions,by increasing the amount of micronutrients as well as organic fertilizers to improve the soil fertility and improve the quality of high-quality tobacco production in the area.
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