CONTENT MOBILE FORMS OF POTASSIUM POLYTSEVOHO AND "ZERO" SOIL IN CROPS OF SPRING BARLEY IN THE RIGHT BANK FOREST-STEPPE OF UKRAINE

The influence of traditional and "zero" tillage on content available forms of potassium in typical black soil in spring barley of short term crop rotation in Right-Bank Forest-Steppe Ukraine was researched. Established that the ten-year implementation of direct sowing provided insignificant increase of mobile potassium in the topsoil compared to plowing. Found that the "zero" tillage provided differentiation of available potassium content in the topsoil, very clearly this pattern observed between the upper 0-10-cm layer and the bottom 10-20 and 20-30-cm layer of soil. The use of annual plowing under spring barley ensured the formation of a more or less homogeneous soil content of available potassium with insignificant deviations of this index in soil layers