Efficiency of microfertilizer application in intensive sunflower cultivation technology

Abstract

The efficiency of sunflower foliar top dressing application with Boro-N and Fertix mark B microfertilizers under field experimental condition was considered. The experiment was conducted in 2020-2022 on gray forest soils of the Bryansk region. Sunflower hybrid Fakel was used as an object of research. Annual grasses were the forecrop in the experiment. Seeding was carried out by the punctuated method with the width of inter-row space (70 cm) at a seeding rate of 55 thousand seeds/ha. The area of the experimental plot is 33 m2, the area of the registration plot is 5 m2 with threefold repetition. Plot placement is systematic. Sunflower farming technology is designed to produce a planned seed yield of 3.5-4.5 t/ha. The experimental scheme included three variants of treatment with microfertilizer Boro-N (2.0 l/ha) + Fertix mark B, BP (2.0 l/ha): without microfertilizer application (control); one treatment; two treatments. It was established that foliar dressing with a tank mixture of Boro-N + Fertix mark B fertilizers once a year during the period of 6-10 true leaves increases the sunflower seed yield by 7%, the profitability of sunflower production by 88%, and the conditional net income by 3.8 thousand rubles/ha. Double application of these microfertilizers during the formation of 6-10 true leaves and in the phase of the end of budding - the beginning of flowering increased the crop yield by 12%, the conditional net income by 4.8 thousand rubles / ha.Additional treatment of sunflower plants before flowering, although reducing the profitability of seed production by 30%, increased the yield of the crop by 5%, conditional net income by 27%.