Abstract
In order to find dependencies between yield of grain corps and moisture regime under conditions of climate change, data was studied for the period 1966-2018. Small climate aridization (hydrothermal coefficient index of G.T. Selyaninov (HTC) was decreasing during last decades) was found. For the first time, the norms of the HTC and productivity, and their deviations were calculated. The revealed peaks and declines in productivity confirm that the main factors are the hydrothermal characteristics of the transitional seasons. The most favorable agro-climatic conditions for the cultivation of the main types of grain and leguminous crops were noted on the territory of the forest-steppe zonal landscape area, and on the territory of the steppe zonal landscape area for the most valuable durum wheat varieties.
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