Study on Nutrition of Tobacco-growing Soil in Yongzhou

Nutritient matters in 664 soil samples taken from main tobacco-growing field in 6 counties of Yongzhou were studied.The results indicated that the average pH value in Yongzhou tobacco-growing field was 7.0,the content of organic matter,total nitrogen,total phosphorus,total potassium,available nitrogen,available P,available K,available Cu,available Fe,available zn,available B,available Mn,available Mo,available S,available chlorine,substitute Ca,substitute mg and cation exchange capacity were 38.7 g/kg,2.4 g/kg,0.8 g/kg,11.1 g/kg,215.2 mg/kg,21.2 mg/kg,84.2 mg/kg,2.9 mg/kg,72.7 mg/kg,1.8 mg/kg,0.1 mg/kg,19.3 mg/kg,0.1 mg/kg,35.9 mg/kg,29.4 mg/kg,10.6(1/2 cmol/ kg),0.9(1/2 cmol/kg),14.0 cmol/kg respectively.According to the current state of the soil being slightly alkaline and rich in nitrogen,chlorine,ferrum,surphur,calcium but lack potassium,boron,molybdenum,suggestions of controlling content of nitrogen,increase potassium、boron and molydenum,and reduce calcium were put forward.