INFLUENCE OF BIOLOGICAL PRODUCTS AND FERTILIZERS ON THE PRODUCTIVITY OF SPRING BARLEY WITH ADDITIONAL SOWING OF PERENNIAL GRASSES

Abstract

Two-factor field experiment was carried out at the research and training station of Ivanovo State Ag-ricultural Academy in 2015-2017. The aim of the research was to establish cooperation effect of various biological products and modified mineral fertilizers on the productivity of spring barley with additional sowing of perennial grasses. As a result of the studies, it was found that the highest average yield of bar-ley grain - 2.13 t / ha, was revealed in the conditions of timothy grass additional sowing as a sub-cover crop. At the same time, the combination of biological preparations Mizorin + Rizoagrin proved to be most effective; on average, the yield of grain and straw with this combination was 2.33 t / ha and 3.42 t / ha, respectively. When choosing meadow clover as a sub-cover crop, the maximum data on grain and barley straw yields of 2.92 t / ha and 4.26 t / ha, respectively, were obtained from the use of combination of biological products Mycorrhiza + Rizoagrin on the background of modified fertilizers. Under condi-tions of sowing a mixture of clover and timothy, the highest yields of grain and barley straw were 2.94 t / ha and 4.29 t / ha, respectively, obtained from the use of the biological product Rizoagrin on the back-ground of modified fertilizers. In the course of the field experiment, positive data on additional income and profitability were obtained on most options, which were maximal in the conditions of replanting a mixture of herbs. Moreover, the largest value of the additional conditionally net income is 21.2 thousand rubles obtained from the use of preparation Rizoagrin on the background of modified fertilizers. And the highest profitability is 91.8 % in the absence of presowing treatment of seeds.