Assessment of the duration of the critical period of co-growing of weeds and maize hybrids in the steppe zone of the Chechen Republic

The goal is to study the possibility of reducing the critical period of co-growth of weeds and corn plants of hybrids of different ripeness groups in the steppe zone of the Chechen Republic. The research period is 2024. The experiment used a medium-late hybrid of corn Krasnodar 425 MV and a late-ripening hybrid of corn Krasnodar 507 AMV. The possibility of using a growth regulator of natural origin - a derivative of humic substances - Humat+7 in a concentration of 0.01% for pre-sowing seed treatment was studied. This method is preferred on the basis of studies conducted in 2023 in the forest-steppe zone of the Chechen Republic. Regardless of the cultivated maize hybrid, there is a mixed type of clogging and a fairly high incidence of pests and diseases, and the issue of increasing the competitiveness of the crop and reducing the critical period of harmfulness of the weed field component is acute. It is this task that is intended to solve the use of natural growth regulators based on humic substances - Gumat+7 - in the technology of cultivating corn in the steppe zone of the Chechen Republic. Without pre-sowing treatment of the seeds of the medium-late hybrid of corn, the critical period for the joint growth of the cultivated and weedy components of cenosis is 30 days from the date of emergence. When using Humat+7 (0.01%) for pre-sowing treatment of seeds, it became possible to reduce the duration of this period to 24 days. The critical period of co-growth of weeds and plants of the late-ripening hybrid Krasnodar 507 AMV is 32 days. When using Humat+7 at a concentration of 0.01% for pre-sowing seed treatment, it became possible to reduce the duration of the critical period of harmfulness to 25 days. When cultivating corn hybrids of different ripeness groups on grain, in order to reduce the critical period of joint growth of weeds and cultivated plants and, as a result, reduce the total number of harmful objects, pre-sowing treatment of seeds with the growth regulator of natural origin Humat+7 at a concentration of 0.01% is necessary.