Assessment and forecast of the humus state of irrigated dark chestnut soils in the Trans-Volga region

Abstract

One of the problematic aspects of the fertility reproduction of irrigated soils is the lack of verified models and parameters necessary to predict the humus state. The formation of the balance of organic matter in irrigated soils is largely predetermined not only by the specificity of ecological and landscape factors of soil formation, but also by the conditions of economic use: the composition of the crop rotation, the level of production intensification, which determines the productivity of crops, ways of using by-products (grain straw) and doses of organic fertilizers. Based on the results of 18 years of observations in the production experience of the fertility parameters of dark chestnut soils, the balance linear-kinetic model of the humus state was verified. The author's approach to forecasting the humus balance of the arable layer of soils is proposed to assess the effect of the structure and productivity of the crop rotation of irrigated arable land. A quantitative assessment of dehumification processes of irrigated soils is given, due to changes in the structure of the use of arable land, where vegetable crops are predominant.