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Phytomeliorative efficiency of the annual grass Kochia scoparia (L.) schrad was assessed. The experiments were conducted on the solonetz of the southern chernozem. It was revealed that the application of high doses of sewage sludge (from 50 to 200 t / ha) contributed to an increase in the yield of green mass of Kochia scoparia by 133–362%. After the combined action of annual grass crops and organic fertilizers, the soil density decreased from 1.47 g / cm3 in the solonetz to 1.25 / cm3 in the variant with a dose of 200 t / ha, water resistance for three years of research increased by 37.8%, water permeability increased by more than 5 times.

Experimental studies of the effect of chelated forms of fertilizers on sorghum yield in arid conditions have been carried out. It is found out that to increase productivity and improve the main economic characteristics of a crop, it is advisable to use liquid chelated micronutrient fertilizers Reasil Forte Carb-Ca / Mg / B-Amino and Reasil micro Amino Zn as foliar application in the phase of 5-7 leaves (first treatment) with subsequent treatments after 10 days. It is proved that this method provides an increase in the yield of grain and green mass of sorghum by 0.27-0.60 and 27.1-39.9 t/ha, respectively, and also increases the content of valuable amino acids in the green mass: arginine, threonine, isoleucine, valine, and phenylalanine, which in turn increases the nutritional value of sorghum green mass for feeding farm animals. It is concluded that foliar application with micronutrient fertilizers reduces plant stress from unfavorable climatic conditions, which leads to stabilization of yields over the years and partially removes dependence on weather conditions.

The article discusses the effect of abiotic environmental factors on crop yields. Abiotic factors cannot be changed by human activity; therefore, considering their impact on yield is very important for predicting crop yields. The article analyzes the dependence of spring wheat yield on such abiotic environmental factors as average ten-day air temperatures during the growing season, ten-day amounts of precipitation during the growing season and the Selyaninov hydrothermal coefficient during the growing season. To identify dependencies, the authors applied a non-linear approximation method using a third-degree polynomial dependence with one variable. The study was conducted during the most important growing season of spring wheat, in May and June. The authors show the equations of the third-degree polynomial dependences and graphs, as well as their graphic interpretation. Based on the obtained graphs, the authors have analyzed favorable intervals of abiotic factors for the formation of high yields of spring wheat. The authors indicate the most optimal temperature and humidity conditions for each ten days of May and June. These dependences are suitable not only for spring wheat but also for other spring grain crops, such as oats and barley.

This article examines the annual and seasonal (winter and summer) changes in the frequency of occurrence of the main types of synoptic processes in the Lower Volga region in two natural climatic periods of the state of the earth climatic system - the stabilization period and the second wave of global warming. The frequency of occurrence of some types of synoptic processes revealed both climatic and seasonal differences. In the second wave of global warming, in comparison with the stabilization period, the frequency of cyclone impact on the Lower Volga region developed on the Arctic front and the number of Arctic anticyclones increase, and the frequency of polar-front cyclones and cases of the impact of the western periphery of the winter Asian anticyclone decreases. Seasonal differences in the frequency of occurrence were revealed in the Arctic anticyclones. During the second wave of global warming, these anticyclones penetrate into the Lower Volga region in summer more often than in winter. It is concluded that the contribution of the transformation factor to the observed warming increases and the role of summer seasons in the observed climatic changes increases, which is not typical for processes in the earth climatic system. It is indicated that obtained result is of great climatological significance and will serve the further development of the physical theory of climate.