Comprehensive Evaluation of Soil Fertility Suitability for Tobacco Planting in Sangzhi Tobacco-growing Area of Zhangjiajie
In order to determine the fertility level of totobacco planting soil in Sangzhi totobacco area,200 soil samples were collect-ed from each township in Sangzhi County and the soil nutrient content was determined.GIS technology and geostatistics were used to construct the corresponding soil nutrient and fertility evaluation system,and the soil fertility suitability(SFI)was comprehensively analyzed.The results showed that the content of alkali-hydrolyzed nitrogen,available phosphorus and organic matter was suitable,the content of available potassium was too high,the content of exchangeable calcium and sulfur was medium,the content of pH val-ue,exchangeable magnesium and chloride ion was low,and the content of chloride ion was very low.The soil fertility(SFI)in tobac-co area was higher,the suitability index of the whole county was 0.67,and the 17 townships(SFI)were all above gradeⅤ,among which the highest average was wheat floor(0.80),and the lowest was fine sand flat(0.50).The smoke area(SFI)grade was 27.50%in high area,44%in high area,23.5%in medium area,4%in low area and only 1%in low area.
flue-cured tobaccotobacco-growing soilfertilitysuitabilityspatial Distribution
NETL
NSTL
万方数据
