Content and Distribution of Potassium in Soils of Henan Tobacco Growing Areas

The contents of potassium in 2116 soil samples collected from tobacco growing areas in Henan Province were analyzed. The results showed that the average contents of rapidly available K and total K were 188.88 mg/kg and 2.28% respectively. The tobacco growing areas in order of contents of rapidly available K were west Henan > east Henan > southwest Henan > south Henan > middle Henan and in order of total K were east Henan > west Henan > middle Henan > south Henan > southwest Henan. The major types of tobacco soil in order of contents of rapidly available K were red clay > fluvo-aquic soil > cinnamon soil > sajong black soil > yellow cinnamon soil > yellow brown earth and in order of total K were yellow brown earth > red clay > fluvo-aquic soil > cinnamon soil > yellow cinnamon soil > sajong black soil. The suitable fertilization method was recommended based on the characteristics of potassium content and distribution of soil in Henan tobacco growing areas.