Plant and Soil Science

In the long-term field experiment on typical black soils the influence of various fertilizer systems and microbial preparation Polymycobacterium on the course of potential activity of nitrogen fixation and biological denitrification in sunflower agrocenosis and the yield of crop in crop rotation were investigated. In the aftereffects of organic fertilizers (manure of cattle, bio compost, lupine green manure, as well as a combination of green manure biomass and straw soya), the biological processes in the soil are optimized. The standards of mineral fertilizers that do not exceed N60P60K60 are environmentally expedient. The introduction of the N90P90K90 is a compromise in terms of ecology. The yield of sunflower is most often increased for the use of Polymycobacterium against the background of mineral fertilizers and organic-mineral fertilizers. The highest productivity of the culture was obtained in variants with the introduction of N90P90K90 and the use of bio preparation, N120P120K120 with bio preparation, as well as for the use of Polymycobacterium against the backdrop of manure and the use of N60P60K60. Finding a compromise between the environmental feasibility of agro methods and their impact on sunflower yields suggests the benefits of organicmineral fertilization, as well as the introduction of N90P90K90 and the use of bio preparation.

sunflower, nitrogen fixation, denitrification, fertilizer systems, yield