Agroecosystem Stability with the Application of Fertilizers and Biopreparations

Resumo

Biomass of spring wheat on sod-podzolic soil largely forms due to soil nitrogen, the share of which reaches four-fifths of the total removal of the element when using mineral fertilizers. Inoculation increases the fertilizer nitrogen use efficiency by 4.5% and reduces losses by 7%; there is a trend to increase the immobilization of N fertilizers. Stability of an agroecosystem is characterized by nitrogen flows. During the growing season of spring wheat, the amount of mineralized nitrogen depending on the fertilizer amounts to 17.4–18.0 g/m², while the amount of reimmobilized nitrogen is 4.4–4.9 g/m² and net-mineralization (N-M) is 13.1 g/m². The inoculation of seeds with Rhizoagrin does not significantly affect the processes of mineralization (M) and reimmobilization (RI) in anything but a positive trend of increase in mineralization and reimmobilization of nitrogen in the soil. The use of nitrogen fertilizer brings the agroecosystem into a state of resistance (the maximum threshold limit of exposure (RI : M = 25% and N-M : RI = 3)). On average, over the years of research, inoculation of seeds with Rhizoagrin did not change the indicators of an agroecosystem’s stability with the application of the fertilizers.