HUMUS BALANCE AND NUTRIENT REGIME OF IRRIGATED SOIL UNDER DIFFERENT SYSTEMS OF BASIC TILLAGE AND FERTILIZER

The article presents an analysis of the results of experimental research in a stationary field experiment to establish the peculiarities of the formation of humus reserves and nutrient regime in the arable layer of dark chestnut soil under the influence of different fertilizer systems and basic tillage. The purpose of research: to establish patterns of conversion of crop by-products of crop rotation into humus and the main elements of mineral nutrition of plants by organic and two organic-mineral fertilizer systems against the background of five systems of main cultivation in 4-field row crop rotation irrigation system in the area of the Ingulets irrigation system. The most favorable conditions for accumulation of leaf mass of crop rotation crops, the formation of a positive balance of humus with an average annual growth of 2.02 t/ha provided organic-mineral fertilizer system using by-products of crop rotations and doses of mineral fertilizers N120 P60 against the background of differentiated main cultivation with one slit to a depth of 38-40 cm per rotation.