THE EFFECTIVENESS OF BIO-STIMULATORS FOR PRE-SOWING TREATMENT OF SUNFLOWER SEEDS

Abstract

In modern technologies of sunflower (Helianthus annuus L.) cultivation, plant growth regulators of both biological and synthetic origin are becoming more widely spread as an effective measure to reduce the nega-tive impact of unfavorable abiotic factors and control the realization of biological potential of crop produc-tivity. The aim of the research was to find out the change of plant biometric parameters and productivity of sunflower areas under the influence of growth bio-stimulators in the Left Bank Forest-Steppe of Ukraine. During the research the following scientific methods were used: analysis, synthesis, field and statistical ones. The results of the study show, that using of plant growth stimulators for pre-sowing seed treatment led to accelerating seed germination, receiving simultaneous seedlings, intensifying growth processes, reducing the duration of interphase periods as compared with the control. It has been found out, that the most effective impact on the formation and functioning of plants’ assimilation surface was observed under combining pre-sowing seed treatment with Mars ELBi (300 ml/t) preparation and foliar fertilization of crops in the phase of 5–6 leaves with Endophyte L1 stimulator (20 ml/ha), where leaf area of plants was 80 thousand m2/ha, or exceeded the control by 33.1 %. Under application of growth regulating substances, the increase of seed weight from a head by 3.1–4.4 g or 5.7–8.1% and thousand-seed weight by 5.2–7.5 g or 10.3–14.9% rela-tive to the control variant was observed. It has been found out that the most favorable conditions for the for-mation of sunflower harvest were created at pre-sowing seed treatment with Mars ELBi bio-stimulator and foliar fertilization of crop areas with Endophyte L1 preparation. The increase in sunflower seed yield made 0.34 t/ha or 12.7 % as compared with the control. It was also effective to use the above mentioned plant growth regulators only for pre-sowing seed treatment, which ensured the increasing of sunflower yield, by 0.30 and 0.21 t/ha or 11.2 and 7.8 %, respectively.