The productivity of spring wheat, the streams of nitrogen and agroecosystem stability with the application of fertilizers and biopreparation

Abstract

To form spring wheat grain at the insufficient bringing of nitric fertilizers the additional sources of nitric feed are necessary. They can be filled in due to the inoculation of seeds with microbial preparation of Rhizoagrin (RA) created on the basis of associative bacteria. The inoculation of seeds of RA provided the increase of grain mass by 15 %. 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. The amount of mineralized nitrogen depending on the fertilizer amounts to 17.4-18.0 g/m2, while the amount of reimmobilized nitrogen is 4.4-4.9g/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 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.