Effect of growth regulators on sunflower seed productivity

Abstract

The results of studying the effectiveness of different growth regulators on the plots of sunflower variety SPK of confectionery direction are presented. Scientific research was conducted in 2021, 2022 under the conditions of insufficient and unstable moistening of the steppe zone of Kabardino-Balkaria. Growth regulators Albit, RP; Zircon, S; Gumi, S; Azofox, S; Amicid Micro, S; Epin-Extra, S and Amino, S were used in the experiments. The plot experiments were laid in eight variants by the method of randomization in three tiers. Variant 1 was the control (no treatment). The area of each plot was 21 m2, threefold repetition. Indicators such as average calathid diameter (cm), 1000 seed weight (g) and average seed yield (t/ha) were studied. On sunflower plants under the action of growth regulators Albit, RP; Epin-Extra, S; Amino, S, the intensity of false powdery mildew development was lower by 4.1; 4.2 and 4.3% relative to the control (without treatment), respectively. Sunflower seed yield as a result of application of growth regulators Albit, RP (variant 2), Gumi, S (variant 4), Epin-Extra, S (variant 7) and Amino, S (variant 8) increased and amounted to 4.1; 3.5; 4.2 and 4.3 t/ha, respectively. Single use of different growth regulators with low concentration increased sunflower productivity in variants 2 (Albit, RP), 7 (Epin Extra, S), 8 (Amino, S) by an average of 1.4 t/ha compared to the variant without treatment. The diameter of the calathids increased in variants 2 (Albit), 6 (Amicid Micro, S), 7 (Epin-Extra), 8 (Amino) by an average of 5.6 cm relative to the control.