The use of foliar fertilizing with complex fertilizers in the technology of cultivating spring wheat of different varieties

The paper discusses the results obtained in a three-factor field experiment on sod-podzolic soil in the Upper Volga region (Tver region) in 2021-2023. The following varieties were studied in the experiment (Factor A): Ivolga, Irgina, Zlata; foliar feeding with complex fertilizers (Factor B) Ultramag combi, 2 l/ha, Aquarin 5, 1 kg/ha, Vitanol PK, 1 l/ ha, control water, 300 l/ha - working fluid consumption; timing of feeding (Factor C): one at the full tillering phase, two at the full tillering stage and the booting phase. The counting areas of the plots according to factor A are 288 m2, B - 72 m2, C - 36 m2, three-fold repetition. It was revealed that foliar fertilizing with all complex fertilizers increases the productivity of varieties. The largest yield increases were obtained from treating crops with complex polymer fertilizer Vitanol PK, which on average for 3 years and for 3 varieties was (13,2-16,3 c/ha 44,6-55,6 %). The varieties Ivolga and Zlata have a greater reaction to foliar feeding. In the conditions of the Upper Volga region, spring wheat can generate yields higher than the level programmed in the experiment - 40 c/ha (with a PAR efficiency of 2%). The maximum yield of 49.0-49,8 c/ha was achieved by the Ivolga and Zlata varieties with two foliar feedings with Vitanol PK. The Irgina variety reduces the yield in the middle of the experiment by 3,3-4,5 c/ha in comparison with other varieties. The increase in yield from foliar fertilizing is ensured by increasing the photosynthetic activity of plants in crops, the progress of the productive process, and improving the structure of the crop.