DYNAMICS OF POTASSIUM SUPPLY OF ARABLE SOILS AND GRASSLAND IN BELARUS

Abstract

The results of Agrochemical Soil Survey for 50 years showed the 3 times increase of mobile K-supply of arable soils and grassland in Belarus. The 2/3 of arable soils square and ½ of grassland are characterized with optimal or high level of mobile K content. At the same districts of country the needs for improvement of K-fertilizer supply of potentially fertile Luvisol clay and loam soils are evident, as well as reduce the K-supply of poorer sandy soils with higher mobile K content. Differentiated norms of K-balance accordingly of initial mobile K content of different textured soils are proposed.