The effect of pre-sowing inoculation of seeds and foliar application of drugs on the productivity and quality of the soybean grain under sprinkling irrigation in the Lower Volga region

Abstract

Purpose: to determine the effect of pre-sowing seed treatment and foliar application of drugs on the productivity and quality of the resulting soybean grain at various water availability under irrigation. The use of a biological preparation as an, inoculant which contributed to the growth of the necessary nodule bacteria on the root system of a given crop and, as a result, carried out the symbiosis of a legume plant, for the assimilation of nitrogen from the air and its conversion into a mineral compound in the soil. Materials and methods. Studies of this technique were conducted on light chestnut soils of the Volgograd region with a medium-ripened variety of own selection Volgogradka 2, bred by the All-Russian Research Institute of Irrigated Agriculture. The laying of experiments and related observations were carried out according to generally accepted methods for two years 2022–2023 on the lands of the All-Russian Research Institute of Irrigated Agriculture (experimental station “Irrigated”, Vodny settlement, Volgograd). Results. The obtained data prove the advantage of pre-sowing inoculation of seeds under different water regimes of this crop. At the same time, the increase in the yield of soybean grain, depending on such pre-sowing treatment, exceeded the control option by 0.40 t/ha under the water regime of 70-80-70 % the lowest moisture capacity and 0.54 t/ha not lower than 80% the lowest moisture capacity. Conclusions. In the conducted studies, the best option proved to be the option with a pre-watering soil moisture threshold of 80% the lowest moisture capacity in moisture layers of 0.4 and 0.6 m and pre-sowing inoculation of seeds in combination with leaf spraying with preparations of various origins, which contributed to a maximum yield of 3.91 t/ha and a profitability level of 242.10 %.

Keywords

• inoculation
• soybeans
• productivity
• seed quality
• irrigation