DYNAMICS OF THE POTASSIUM STATE OF CHERNOZEM TYPICAL UNDER CONDITIONS OF ITS EXTENSIVE, INTENSIVE AND POST-INTENSIVE USE

Abstract

It was established influence of the use type of arable soils on the dynamics of the content of available forms of potassium. Extensively used chernozem typical heavy loamy with a high content of potassium is able to maintain a stable, but relatively low level of available potassium in the soil for a long time. It is proved that an increase in the content of available potassium in the soil is possible only when potassium fertilizers are used. To increase the content by 10 mg/kg K₂O, it is necessary to apply 417 kg K₂O/ha to the soil with fertilizers. After stopping the use of potassium fertilizers, the content of potassium in the soil is reduced to the initial level. For a chernozem typical heavy loamy, the level of dynamic equilibrium of the potassium system is characterized by the content of available forms of potassium within the limits of 60 mg K₂O/kg of soil, determined by the Chirikov method according to DSTU 4115 or 80 mg according to GOST 26204.