Analysis of Nitrogen and Phosphorus Potassium Distribution Characteristics Variance for the Main Tobacco Soil Type Profile in Liangshan

To definite the physical and chemical properties for Liangshan major tobacco soil types and provide a guidance for tobacco production,the method of descriptive statistics and systematic cluster analysis were used to analyze the content of available nitrogen,phosphorus and potassium at each layers of soil profile and the differences between soil types in 6 tobacco planting soil of Liangshan tobacco area in 2011.The results showed that: the content of available nitrogen,phosphorus and potassium were widely variant for all soil types in Liangshan tobacco area.The content of available nitrogen reduced as the increasing of soil depth in soil profile.However,available potassium content first greatly reduced and later slightly increased.There was no obvious regularity in the profile between different layers for available phosphorus.Nutrient content of different soil types was generally low in 20-40 cm soil layer.Deep transplantation,high ridges green manure planting and deep inplough were recommended to 20-24 cm soil layer improvement to provide quality soil fertility basis for tobacco growth.