INFLUENCE ON THE EFFICIENCY OF JOINT USE OF PLANT PROTECTION MEANS IN COMBINATION WITH MINERAL NUTRITION OF WINTER WHEAT IN CONDITIONS OF UNSTABLE MOISTURE OF ANDROPOVSKY MUNICIPAL DISTRICT

Abstract

The studies were conducted in the conditions of Andropovsky Agrocomplex LLC, Andropovsky Municipal District, Stavropol Krai in 2021-2023. The scientific novelty of the studies was that for the first time in the Stavropol Krai, the effectiveness of the combined use of plant protection products was studied, against the background of the application of mineral fertilizers in winter wheat crops in the conditions of Andropovsky Agrocomplex LLC, Andropovsky Municipal District. The experiment is two-factorial, represented by the following factors. Factor A - mineral fertilizers. Factor B - plant protection system. The experiment studied the winter wheat variety Tanya. The experiment is production, threefold replication, the area of the experimental plots is 1.2 hectares. The predecessor during the research period was winter barley. The following fertilizers were used: 100 kg/ha (N10P26K26) for the main application of DAFK (diammophoska), 100 kg/ha (N16P16K16) for sowing, 100 kg/ha (N16P16K16) of NАА (ammonium nitrate) as a top dressing during the tillering phase (N35), and 100 kg/ha (N35) during the boot phase. The maximum nitrate nitrogen content on average in the experiment was during the boot phase of winter wheat (10.9 mg/kg), subsequently it decreased, and the minimum values were obtained during the phase of full crop maturity (8.2 mg/kg). On average, no reliable differences were observed between the studied plant protection systems in the experiment, and the difference between the system of Agro Expert Group LLC and the protection system was 0.69 mg/kg of soil. The maximum content of mobile phosphorus on average in the experiment was noted in the tillering phase of winter wheat (19.7 mg/kg), subsequently its decrease was observed, and the minimum values were obtained in the phase of full maturity of the crop (16.1 mg/kg). The studied dose of fertilizer reliably increased the content of exchangeable potassium compared to the control, and the difference was 3-17 mg/kg during the tillering period, 6-22 mg/kg in the tube emergence phase, 12-25 mg/kg in the heading phase, and 12-22 mg/kg in the phase of full maturity.