Sustainability of the agroecosystem in the application of fertilizers and biopreparations

Abstract

The formation of biomass of spring wheat on sod-podzolic soil is mainly due to soil nitrogen, the share of which reaches 4/5 of the total removal of the element when using mineral fertilizers. Inoculation increases the nitrogen content of fertilizers by 4.5%, reduces losses by 7%; there is some tendency to increase the immobilization of N fertilizers. The sustainability of the agroecosystem is characterized by nitrogen flows. During the growing season of spring wheat, the amount of mineralized nitrogen depending on the fertilizer reached 17.4-18.0 g/m2, while the amount of remobilized nitrogen was 4.4-4.9 g/m2, net-mineralization (N-M) – 13.1 g/m2. The inoculation of RA seeds does not significantly affect the processes of mineralization (M) and remobilization (RI), only a positive trend of growth of mineralization and remobilization of nitrogen in the soil is observed. The use of nitrogen fertilizer leads agroecosystem in a resistant state-the zone of the maximum permissible level of exposure (RI:M=25%, N-M:RI=3.0). On average, over the years of research, inoculation of RA seeds does not change the indicators of sustainability of agroecosystem when applying fertilizers.