The influence of agrometeorological factors on the duration of vegetation and the yield of the green mass of the Sudanese grass Zemlyachka line

Relevance . In modern realities, reliable sources of cheap and high-quality feed are needed. Changing weather conditions have a great impact on crop yields. The paper analyzes the influence of the weather conditions of the region on the introduced Sudanese grass of the Zemlyachka line. Results . As a result of the studies, the average duration of interphase periods in the Sudanese grass Zemlyachka line was established, correlations of the duration of interphase periods on the sum of active temperatures, precipitation and hydrothermal coefficient are found. It has been established that at the initial stage, high amounts of active temperatures are vital for the development of the Sudanese grass of the Zemlyachka, and the presence or absence of precipitation during this period does not significantly affect the duration of the phases. Low average daily temperatures lead to an increase in the duration of interphase periods, as well as to an increase in the sum of the active temperatures of the periods. An increase in precipitation at the middle stage of ontogenesis leads to its elongation. A close correlation has been established between the yield of green mass and the sum of active temperatures during the periods “sowing — shoots” (r. = 0.8) and “shoots — exit into the tube” (r = 0.77), as well as on the duration of the period “shoots — entry into the tube” (r = 0.93). The average yield of green mass over the years of research was 46.2 t/ha, the Sudanese grass Zemlyachka is a good source of feed. The life cycle of a culture in the conditions of the region remains, as a rule, unfinished, seeds must be purchased from producers from the southern regions.