INFLUENCE OF COMPLEX APPLICATION OF FERTILIZERS ON PRODUCTIVITY AND QUALITY OF FODDER CROPS IN THE CONDITIONS OF THE REPUBLIC OF KOMI
In the conditions of the Komi Republic, the effectiveness of various doses of organic and mineral fertilizers, as well as their combined use in short-term feed crop rotation, was studied in a field stationary experiment on sod-podzolic soil. As a result of scientific research (more than 40 years), it was found that the organo-mineral fertilizer system was the most effective. As a result of long-term research, it was found that the most significant yields of forage crops (on average for 3 rotations) were obtained using 80 t/ha of TNK and NPK: annual grasses - 4.4, perennial grasses - 6.2 and potatoes - 7.1 t/ha of high-quality dry matter. The dry matter content in potato tubers in the variants with NPK was 18.0-18.8%, on an organic background - 18.4-18.9, and with the complex application of fertilizers - 17.1-17.7, in the control - 19.6%. The amount of starch in potatoes slightly differed in the variants of the experiment and was equal to 12.6-13.1%. The nitrate content did not exceed the MPC (250 mg/kg of raw mass). The amount of dry matter of annual and perennial grasses changed slightly and amounted to 19.0-19.8 and 25.0-26.8%, respectively. It was found that fertilizers contributed to the increase in crude protein in annual and perennial grasses to 13.1-15.0 (in the control - 11.2%) and 8.8-10.6% (in the control - 8.1%).