THE DURATION OF THE GROWING SEASON AND THE INTERPHASE PERIODS OF SOYBEAN VARIETIES DEPENDING ON THE TIMING OF SOWING AND SEEDING RATES

Abstract

The results of studies of the duration of interphase periods and vegetation of soybean varieties of different groups of ripeness depending on the sowing time according to the soil temperature regime of 6°C, 8 °C, 10 °C, 12 °C, and seed rates of 600, 700,800 and 900 thousand pieces per 1 ha were conducted. Weather conditions are analyzed and the influence of the studied factors on the features of the formation of linear plant sizes and generative organs and productivity is studied. It was found that the duration of interphase periods, depending on the timing of sowing over soil temperature conditions, was longer in the early stages and decreased according to an increase in the rate of sowing seeds and sowing at a later date, while the total duration of the growing season and individual interphase periods is determined by the genetic characteristics of soybean varieties of different ripeness groups. The conclusions are made according to the results of the research and have scientific and applied value for the producers in cultivation of soybeans in the conditions of the Forest Steppe of the Right Bank.