Analysis of the Nutrient Status of Tobacco-growing Soils in Luoyang

Three hundred and forty-six soil samples selected from Luoyang tobacco-growing areas were determined.The results showed that the average contents of the available nitrogen,phosphorus and potassium,and the organic matter were 44.6,10.2,147.9 mg/kg,and 12.2 g/kg,respectively.As a whole,they were medium level,in which,78.0% of available N ranged from 30 mg/kg to 60 mg/kg,87.0 % of available P from 5 mg/kg to 20 mg/kg,74.6% of available K from 100 mg/kg to 200 mg/kg,and 69.4% of organic matter from 10 g/kg to 15 g/kg.The order of coefficient of variation(CV) was available Pavailable Navailable Korganic matter.Frequency distribution of available K content was normal with Kolmogorov-Smirnov Test.Frequency distribution of the contents of organic matter and available N and available P were approximate normal with no significant level tested by K-S.