EFFISIENTCY OF POTASH FERTILIZER ON SOD-PODZOLIC LIGHT LOAMY SOIL WITH DIFFERENT ACIDIC AND SECURITY OF MOBILE POTASH

Abstract

In field stationary experience on sod-podzolic light loamy soil is established, that the efficiency of potash fertilizer grows in process of reduction acidic soil and is reduced with growth of security of soil mobile potash. At a level of security of soil mobile potash 200-250 mg/kg the increase of dozes potash in soil with 88 up to 143 kg/hа of the area croup rotation promotes growth of increases of productivity on a background acidic рН 4,8-4,9 with 2,2 up to 5,4 c/ha f.u. (16-32%), on a background with рН 5,4-5,6 - with 2,3 up to 6,8 (27-40,9%) c/ha f.u., on a background with рН 6,3-6,5 - with 3,7 up to 9,2 c/ha f.u. (31-52%). Return 1 kg potash by a crop in process of decrease(reduction) acidic of soil and increase of dozes potash accordingly grew and made 2,5-3,8 kg f. un. 2,6-3,9 kg f. un. аnd 4,2-6,4 kg f.u/. The reduction acidic of soil with рН 4,8-4,9 till рН 6,3-6,5 on increased and high level of security of soil mobile potash in creases the pure income to 27,0 up to 61,2 USD, profitability with 76,9 up to 137,2%.