Purpose: to study the growth regulator Emistim effect on cotton development and yield under irrigation in Rostov region.
Materials and methods. Field studies were conducted in 2024. The experimental design included the following options: seed treatment, foliar treatment, seed treatment plus foliar treatment, control (without regulator). The experiments were carried out in accordance with generally accepted methods, taking into account zonal features.
Results. The highest field germination was determined in the variant of combined action of seed treatment and foliar treatment – 90 %. This variant also showed the best result in linear growth of cotton plants by the ripening phase – 79.6 cm, which is 7.6 cm higher than the control, and in the increase in the leaf-area duration – the excess of the control was 3.25 thousand sq. m/ha. A greater accumulation of cotton dry biomass by the ripening phase was established in this variant, the values here exceeded the control by 22.6 %, and the highest yield was 24.7 c/ha of raw cotton, which is 7.4 % higher than the control. In other variants, the difference with the control was 3.9 and 2.2 %. Minimal differences from the control by the ripening phase were observed in the variant with foliar treatment with a growth regulator for all indicators.
Conclusions: a positive effect of the growth regulator Emistim on the development and yield of the Phoenix cotton variety in the first year of research with irrigation in the conditions of Rostov region was revealed with all types of treatment, but the most significant – with the combined effect of seed treatment and foliar treatment.
cotton, growth regulator, irrigation, yield, dry biomass, leaf-area duration
Yurkova R. Ye., Selitsky S. A. Effect of growth regulators on cotton development and yield under irrigation. Ways of Increasing the Efficiency of Irrigated Agriculture. 2025;95(1):1–12. (In Russ.).
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