Sunflower protection from weeds according to the Clearfield system in the Volga Federal District
A prerequisite for obtaining high yields of any crop, including sunflower, is to control the weediness of crops. It is very important to keep sunflower crops free of weeds for 35 - 40 days after sowing, since at this time the formation of baskets occurs. The research was carried out in 2018 - 2020. in the farms of the Orenburg and Samara regions in order to study the effect of herbicides containing imazamox C15H19N3O4, 33 g/l + imazapyr C13H15N3O3, 15 g/l, when used against weeds according to the Cliarfield production system in crops of sunflower hybrids resistant to imidazolines. According to the results of the study, it was found that the treatment of sunflower hybrids Sanay MR, NK Fortimy, Colombi according to the Cliarfield system with Kaptora, Soteira and Mantra herbicides at a rate of 0.8 - 1.2 l/ha was effective in combating weeds, broomrape and provided good yield. A higher economic effect was provided by the herbicides Soteira and Mantra at a rate of 0.8 - 1.2 l/ha due to their low cost. In 2019 - 2020 herbicides Soteira and Kaptora, 1.2 l/ha, in a tank mixture with antistress drugs Fitosporin AS, 1 l/ha + Borogum V-11, 1 l/ha + Bionex Kemi 10: 10: 10 + ME, 3 l/ha + Biolipostim, 0.25 l / ha provided in a number of farms 100 % weed death with an average seed yield of 20.2 - 22.8 c/ha, the yield of untreated crops was only 17.4 - 19.9 c/ha. The highest economic results were obtained when using herbicides Soteira, Kaptora, Mantra at a rate of 1.0 - 1.2 l/ha mixed with biological adhesive Biolipostim, 0.25 l/ha.