The formation of a crop of fodder and semi-sugar beet under irrigation in conditions of global warming

Relevanse. To reduce the negative impact of drought on the production process of agrocenoses of field crops, the entire complex of agrotechnical and reclamation measures should be used to ensure increased drought resistance of crops in the structure of crop rotations for various purposes. The purpose of our research was to study the dynamics of the growth of the raw mass of root crops and the collection of dry matter by the periods of growth and development of fodder and semi-sugar beet at different moisture levels of the root layer of the soil. Material and methodology. The research was carried out in a specially built arid zone, which is a 3x20 m plot, isolated from soil moisture to a depth of 1.5 m by a clay castle along the periphery and a dense reinforced polyethylene film between the variants. The arid area was divided into four plots, each with an area of 15 m2 (3x5 m), in which a different level of moisture supply was maintained throughout the growing season. The variety of fodder beet Eckendorf yellow and semi–sugar beet – Semi-sugar pink variety were used as the object of research. Results. It has been established that at all values of humidity, the maximum accumulation of the raw mass of root crops in both varieties was noted in the second period of growth and development of plants, which lasts an average of 60 days and lasts from the beginning of closing of crops in rows to the beginning of opening in row spacing. Among the studied irrigation regimes, the option should be recognized as optimal, where during the growing season the relative humidity of the root layer at a depth of 1 m is maintained at the level of 70-75% of the WPV. With such moisture, the yield of root crops for fodder beet is 855 centners/ha, for semi-sugar beet – 679 centners/ha, and the collection of dry matter – 120.54 and 156.33 centners/ha, respectively. With a further increase in humidity to 75-80% of the FPV, the increase in yield and collection of dry matter per 1 ha of crops for both beet varieties is within the statistical error of the experiment, however, the cost of irrigation water for the formation of 1 q of dry matter increases by an average of 2.2 times, which negatively affects the cost of grown products. It has been proven that the optimal regime of soil moisture is provided by the irrigation scheme according to the periods of growth and development of plants 1 3 1; irrigation rate – 400 m 3 /ha, irrigation rate – 2000 m 3 /ha.