INFLUENCE OF NITROGEN FERTILIZERS ON THE PRODUCTIVITY OF PERENNIAL CEREAL GRASSES ON PEARLY-GLAY SOIL

Abstract

The use of nitrogen fertilizers in rates from 100 to 140 kg/ha increases the productivity of perennial grasses on the background of P₉₀K₁₅₀ from 92.9 to 105.9 C/ha of hay or from 47.4 to 54.0 C/ha of feed units, on the background of P₉₀K₁₈₀ - from 97.0 to 110.7 C/ha of hay or from 49.5 to 56.5 C/ha of feed units. Maximum productivity is provided when using N₁₄₀P₉₀K_{180 -}110.7 C/ha of hay or 56.5 C/ha of feed units. Increases in hay due to nitrogen fertilizers on backgrounds with different doses of potash fertilizers are close and make up 30.4-43.4 C/ha price or 15.5-22.1 C/ha of feed units against the background of P₉₀K₁₈₀ - 29.1-42.8 C/ha of hay or 14.9-21.9 C/ha of feed units. The highest payback of nitrogen fertilizers with an increase in yield is formed when they are applied in rates of 120 kg/ha. Against the background of P₉₀K₁₅₀, it was 33.8 kg of hay or 17.3 feed units, against the background of P₉₀K₁₈₀ 33.1 kg of hay or 16.9 feed units.