Abstract
In the conditions of the North Kazakhstan region, the moisture supply of the growing season of spring soft wheat is characterized by an uneven distribution of precipitation, which affects the yield of grain crops. This process can be observed using the G.T. Selyaninov hydrothermal humidification coefficient (GTC). A scientific study during 2022-2023 was conducted in order to influence moisture availability on the grain yield of spring soft wheat in the North Kazakhstan region. The methodology consists in calculating the hydrothermal coefficient in the interphase periods of spring wheat for calendar years: 2022 and 2023. The calculation of the elements of the crop structure and grain yield was also carried out. In accordance with the moisture availability of the growing season of spring wheat, the main elements of the crop structure: productive bushiness, ear water content, pcs; weight of 1000 grains, g showed themselves stronger in 2023, respectively: 1.1; 21; 33, than in 2022. Moisture availability of the period of release into the tube - grain ripeness in 2022 took place in satisfactory conditions for spring wheat, which affected its grain yield of - 15 c/ha. In 2023, the stages of wheat organogenesis before the earing period passed favorably, despite the subsequent poorly satisfactory wet conditions before grain maturation, the harvested plants showed good productivity potential - 17c/ha, which exceeded the grain yield of 2022. The use of the hydrothermal coefficient makes it possible to apply agrotechnical techniques to increase the yield of spring wheat grain in unstable periods of moisture availability.