YIELD AND BIOCHEMICAL STATUS OF CORN DEPENDING ON THE MINERAL NUTRITION AND THE PLANT POPULATION DENSITY

The article presents the results of studies on the effect of various dosages and methods of applying mineral fertilizers on the formation of yield and biochemical composition of corn phytomass depending on the density of standing plants. The studies were carried out on leached heavy loam chernozem. Pre-sowing application of mineral fertilizers in the norm N120 P90 contributed to an increase in the yield of green mass by 26%, and dry matter by 20.6%. The transfer of nitrogen part (N 30) to soil dressing increased the collection of raw biomass by 49.8%, and dry biomass by 27.1% relative to the level of natural soil fertility. An additional raw biomass and dry biomass (39.2 % and 39.3%, relatively) were obtained when N120 P90К60 was applied. On a non-fertilized agricultural background, when nitrogen-phosphorus fertilizers are applied and nitrogen fertilization is carried out, the increase in phytomass yield is noted to a density of 100 ths. units/ha. The maximum yield was obtained at a density of 90 ths units/ha on the background of N120P90К60. A single application of mineral fertilizers supported the improvement in the protein content of the feed and increased the crude protein content in the biomass by 1.04-1.36%. When nitrogen fertilizers were applied in portions, the increase was 2.64 % to the natural fertility level and 1.39 % compared to a single application of nitrogen-phosphorus nutrition. On the non-fertilized agricultural background with increasing density of plants, a decrease in protein provision of the biomass was noted. On the variants with the application of nitrogen-phosphorus fertilizers, the increase was noted up to the density of 80 ths. pcs/ha. And on the background of N120P90К60 it was up to 70 ths. pcs/ha. The same pattern was seen in the content of raw fat.