The stimulating preparations role to decrease herbicide stress when growing tobacco

The purpose of research is to study the effect of growth regulators in reducing the phytotoxicity of the herbicide on tobacco plants. The studies were carried out in 2020-2021 in the central zone of the Krasnodar Region during the seedling and field periods on the tobacco variety Trapezond 25. The objects of the study were the soil herbicide Command, introduced two weeks before sowing tobacco, and the plant growth regulators (PPR) Amicide, Zerebra agro and Regoplant. PPP treatment was carried out before sowing seeds (soaking for 12 hours, 3 hours and 6 hours, respectively) and on vegetative plants in the main phases of seedling development “ears” and “ready for planting”. It was found that the use of PPP as antidotes contributed to an increase in the length of tobacco seedlings to the point of growth by 23-42 %, to the end of elongated leaves - by 26-51 %, root phytomass - by 43-92 %, ground phytomass - by 44-60 % relative to the control. An excess of the output of standard seedlings by 6-9 % relative to the herbicidal background and by 38-41 % relative to the control was noted. Prolonged action of Zerebra agro, Regoplant and Amicide preparations was observed during the field period, which was reflected in tobacco plants - an increase in height, leaf surface area and leaf materiality. The yield of tobacco relative to the control (20.8 q/ha) increased in the variant with the use of Amicide by 23 % (25.6 q/ha), Zerebra agro - by 24 % (25.8 q/ha), Regoplant - by 22 % (25.3 q/ha), herbicide Command, EC - by 12 % (23.2 q/ha). The use of PPP against a herbicidal background made it possible to improve the indicators of the chemical evaluation of tobacco raw materials by reducing proteins and increasing carbohydrates (the main quality indicator: carbohydrate-protein ratio or Schmuck number).