The purpose of this work is to analyze the spring wheat yield and grain quality when grown using agricultural biologicals "Azofit N" and "Azofit P" against the background of reducing doses of mineral fertilizers in various soil fertility zones of fields compared to the basic option of their use. "Azofit" is a microbiological fertilizer with fungicidal and stimulating properties. The place where the experiments were carried out was APC "Kolos", located in East Kulunda arid steppe zone. This zone is characterized by insufficient moisture during the growing season with a large amount of heat and light. The relief is flat. The climate is continental. The average temperature in January is minus 18.0 оС, in July 19.0 оС. Annual precipitation is 340 mm. Soils are southern chernozems. Field selection was based on soil fertility maps of "Cropio" online-platform. In each of three fertility zones of the experimental field, 4 variants of combinations of doses of granular and liquid mineral fertilizers with dosage compensation were implemented. Spring wheat variety "Buran" was sown, forecrop was spring wheat. The results showed that when the dose of mineral fertilizers was reduced from control (100%) to 85% and biologicals were used, the average wheat yield increased by 1.7 c/ha (from 39.0 to 40.7 c/ha). And with a further reduction of fertilizer dose to 70 and 50% of control, the average yield decreased to 37.5 and 34.9 c/ha, respectively. The differences are statistically significant. Thus, the compared variants of fertilizer doses and the use of biologicals in soil fertility zones had a significant joint effect on plant development, and significantly affected the gluten content in grain and wheat yield.

Belyaev Vladimir I., Prokopchuk Roman E., Cherepanova Olga V., Sokolova Liudmila V.

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