Study of the impact of influence of nitrogen fertilization on the energy value of sorghum grain in non-ruminants

Abstract

The effect of different levels of nitrogen fertilization on the chemical composition and energy value of sorghum grain in non-ruminants was studied. The study was conducted in the experimental field of Agricultural Institute - Stara Zagora on meadow - cinnamon soil with grain sorghum medium-late hybrid Maxibel. The study included the following four fertilization variants: lime. 1 - non-fertilization, var. 2 - fertilization with N₅, var. 3 - fertilization with N₁₀ and var. 4 - fertilization with N₁₅. Nitrogen fertilizer was applied during the crop vegetation at the 3-5 leaf stage, and phosphorus and potassium fertilizers were applied at the rates of P₈ and K₆ at the main tillage. In nitrogen fertilization of grain sorghum, increasing the rate leads to an increase in the content of crude protein, and in the variant with the highest fertilizer rate - N₁₅ the highest content of crude protein in dry matter - 110. 9 g.kg ^-1. It was found that the level of fertilization had no significant effect on the digestible and metabolizable energy content of sorghum grain in pigs and poultry.