Abstract
The transition to a new reference period of 1991-2020 requires updating the estimates of agroclimatic resources in agricultural regions. The paper summarizes the results of the annual monitoring of agroclimatic conditions over 1961-1990 and 1991-2020 obtained by both the statistical analysis and the Climate-Soil-Yield simulation system and provides their comparative evaluation. It has been noted that along with growing aridity of the most fertile areas of the steppe and forest-steppe zones, there is an almost universal growth of spring precipitation, which compensates to some extent the negative impact of high summer temperatures on the yield. A significant decrease in the climate-driven productivity of spring wheat from the period of 1961-1990 to the new reference period of 1991-2020 has been revealed for the main grain-producing regions. Estimates of productivity trends for major grain crops, spring and winter wheat, are given in connection with climate change and the development of agricultural technologies. Estimates of changes in the wintering indices and sown areas for winter wheat are also given.
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