DIFFERENTIATION OF SUNFLOWER MINERAL nutrition CONTROL BASED ON THE APPLICATION OF BIOPREPARATIONS OF ASSOCIATIVE NITROFIXATION IN THE CONDITIONS OF THE ROSTOV REGION

Abstract

The article presents the results of three-year studies of the effect of biological products produced by the All-Russian Research Institute of Agricultural Microbiology (St. Petersburg) and mineral fertilizers, when applied jointly and separately, on the yield of sunflower on ordinary chernozem in the north-western zone of the Rostov region. The research carried out made it possible to give recommendations on the differentiation of sunflower nutrition control when producing products with different characteristics. For the production of oilseeds of ordinary quality, the greatest effect was after N60P40-fertilization during cultivation in spring. The increase in yield to the control was 0.31 t / ha, or 22.6%. To reduce the intensity of spring field work, autumn N60P40K40- or N60P80-fertilization during plowing will be equivalent. If it is necessary to reduce the anthropogenic load on the agrocenosis and produce agricultural products of improved quality, N30P40-fertilization in spring in combination with the application of the biological product Mizorin 7 into the rhizosphere of plants should be preferred. The increase in yield to control was not inferior to the traditional fertilization system. In order to obtain organic products without mineral fertilization, it is advisable to adjust the nutrition of sunflower only by application of biological preparations with strains of associative nitrogen fixers into the rhizosphere - Mizorin 7, Mizorin 204 and 2P-7. This agricultural practice increased the yield of sunflower sowing by 11.7-14.6%.