Analysis of Contents of Medium and Trace Elements in Burley-tobacco-planting Soil of Dazhou and Fertilization Measures

The medium and trace element contents in 30 soil samples collected from Burley-tobacco-planting areas of Xuanhan county in Dazhou were analyzed.The results showed that the average contents of exchangeable Ca,exchangeable Mg and available S were 278.88,27.56 and 37.08 mg/kg respectively.The average contents of available Fe,Mn,Cu,Zn,B and Cl were 63.72,55.96,0.19,2.11,0.15 and 91.81 mg/kg separately.The contents of exchangeable Ca,exchangeable Mg,available Cu and available B in the soil were deficient,while the contents of available S,Zn,Fe and Mn were abundant in general,yet the content of Cl was high.Therefore,in the production of Burley tobacco,the deficient nutrition elements should be scientifically supplied according to the local conditions,and the application of chlorine-containing fertilizer should be prohibited.