Keywords: crop adaptation, Poozerye, microlandscapes, hydrothermal coefficient, alfalfa, meadow clover, surface planning, fertilization

// Мелиорация.– 2020. – №3(93) – P 55–64

The dependence of the productivity of grain crops on the hydrothermal conditions on heavy loamy soils of Poozerye has been established. It is shown that with the greatness of the HTC 2,0‒2,5, the minimum yield is formed. It is proposed to change here the structure of sown areas towards an increase in the share of perennial legumes. Based on 37 years of research, a high efficiency of drainage reclamation on sod-gley soils has been revealed. The expediency of using increased doses of potash fertilizers on old-growth herbage with the participation of alfalfa has been proven. The deterioration of the botanical composition of the herbage in the variant without fertilization is distinguished by a decrease in the proportion of the legume component. Data on the decrease in the content of calcium and magnesium
carbonates in the arable layer as a result of long-term use of drained soils of light granulometric composition in comparison with the undrained area are presented.