Influence of growth-regulating preparations on the herbicides phytotoxicity on spring wheat

The aim of this study was to evaluate the effects of tank mixtures of herbicides and various growthregulating agents on spring wheat plants during the growing season. The pot experiment was conducted at the Moscow Timiryazev Agricultural Academy. The spring wheat variety Lyubava was chosen as the object of the study. The test crop was treated with tank mixtures of herbicides and growth-regulating agents during the tillering stage. The herbicides used were Bomba, SE, and Ballerina, as well as VDG, which inhibit the formation of acetolactate synthase, an enzyme involved in the synthesis of essential amino acids. The growth-regulating agents used were Panch (amino acids), Potassium Humate (humic substances), Apasil (silicon), Aquamix, ST (microfertilizers), and Epin Extra (phytohormones). Herbicide application was found to reduce plant photosynthetic activity by an average of 43 units, or 13%, compared to the control. A critical period for the crop under herbicide stress was established one day after treatment, as evidenced by the lowest N-tester values obtained throughout the experiment. It was found that one day after treatment, photosynthetic activity in plants treated with the herbicide decreased by 20% compared to the untreated control. Adding growth-regulating agents based on humic substances, silicon, and phytohormones to the herbicides did not significantly affect the stabilization of plant production. The use of micronutrient fertilizers and amino acids in mixtures with herbicides had a positive effect on crop quality. In the amino acid treatment, grain protein content was observed at the control level, while in treatments with other growth-regulating agents, it was 1.8–2.3% lower. Thus, to support the production process and preserve the potential of plants under unfavorable conditions, it is recommended to add growth-regulating preparations based on amino acids and micronutrients in chelated form to herbicide treatments.

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