Annotation

The results of the studies of the influence of different backgrounds of mineral nutrition on the provision of dark gray podzolic soil with alkaline hydrolyzed nitrogen and protein content in the grain of spring barley in the Western Forest-Steppe of Ukraine are presented. In order to study this issue, a two-factor experiment was established. According to the factor A, the norms of mineral fertilizers were introduced with a sequence of options: 1) Without fertilizers (control); 2) N₃₀P₃₀K₃₀; 3) N₄₅P₃₀K₃₀; 4) N₆₀P₃₀K₃₀; 5) N₄₅P₄₅K₄₅; 6) N₆₀P₄₅K₄₅; 7) N₆₀P₆₀K₆₀. Factor B included options for foliar fertilization of crops: 1) Spraying with water, 2) Fertigrain Foliar, 1.1 l/ha.

It is noted, that the use of mineral fertilizers has a positive effect on the change in the content of alkaline hydrolyzed nitrogen in the studied soil type in the tillering phase of spring barley. The most favorable conditions for mineral nutrition of spring barley provided options with the introduction of higher nitrogen levels in the composition of complete mineral fertilizers. Due to application of N₆₀P₃₀K₃₀, the content of alkaline hydrolyzed nitrogen in the soil layer 0–20 cm increased relative to the variant without fertilizers by 28 mg/kg of soil and amounted to 122 mg/kg of soil. On the background of N₆₀P₄₅K₄₅ application, it increased to 125 mg/kg of soil and exceeded the control by 31 mg/kg of soil. The highest indicator of soil supply with alkaline hydrolyzed nitrogen was obtained with the application of mineral fertilizers in the norm N₆₀P₆₀K_60, where it was 134 mg/kg of soil, the increase to the unfertilized variant was at the level of 40 mg/kg of soil.

The positive effect of mineral fertilizers and foliar fertilization of spring barley with organic fertilizer Fertigrain Foliar on their background on the protein content in grain was established. Depending on the rate of mineral fertilizers application, the increase in protein content varied from 0.38 % against N₃₀P₃₀K₃₀ as compared to the control, where it was the lowest to 1.33 % in the application N₆₀P₆₀K_60, which was the highest value. Fertilizing Fertigrain Foliar with mineral fertilizers on the background of mineral fertilizers increased the effectiveness of their actions, which was accompanied by an increase in protein content. The highest efficiency of foliar fertilization was manifested on the background of mineral fertilizers in the norm N₆₀P₆₀K_60. In this case, it was 11.5 % and exceeded the background without fertilization by 0.27 %.