Abstract: The quick-acting potassium and the slow-acting potassium of major soil types of the Inner Mongolia and Shanxi in loess plateau is studied in the present paper.The results obtained are summarized as follows:The distribution of soil potassium on the Inner Mongolia and Shanxi province in loess plateau is:l.The content of quick-acting and slow-acting potassium of different soil type in Obrdos platform is lower than that in different soil type of Hetao area.2,The content of quick-acting and low-acting potassium gradually increases from north to south on loess hills and basin of middle part in Shanxi province.The quick-acting and slow-actng potassium content is negatively correlated with sand on large scale,but positively with organic matter on a soil type.The quick-acting potassium content accords with power equation(Y=ax-b)in different soil types in Shanxi province,and the model of distribution of slow-acting potassium content is low valley or bow form on soil profile.

Key words: Soil potassium, Quick-acting potassium, Slow-acting pota-ssimm