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The article shows the results of a comparative assessment of grain productivity and adaptability parameters of early- ripe maize hybrids in the South-West of non-chernozem region (Bryansk region). The aim of this work is to study and evaluate the productive and adaptive potential of early- ripe maize hybrids in the agroclimatic conditions of the non-chernozem region. 22 hybrids of the early- ripe group (FAO 100-200) were taken as the object of research. The tasks of agroecological examining for the period 2016-2019. included an overall assessment of adaptive properties of studied maize genotypes in terms of environmental stability and plasticity, using the “yield” criterion. The features of the production process of maize seeds depending on changes in meteorological conditions of cultivation for the years of examining were studied, which allowed us to assess objectively the level of variation in the grain yield. We calculated the following indicators: index of environmental conditions (Ij), parameters of environmental plasticity - stability (Sd2) and plasticity (bi), stress resistance, yield span (d), ultrastability (Hom), variation coefficient (V). As a result of examining carried out over 4 years, the yield of maize grain varied from 6.02 t / ha of the LG 2195 hybrid of Limagrain Europe selection (France) to 8.69 t/ha of the Ladoga 181 MV hybrid (NGO “Kuban Seed Production”). According to the set of adaptability parameters, hybrids of domestic selection Ladozhsky 181 MV, Ladozhsky 191 MV, Krasnodar 194 AMV and foreign selection - P7954 (Pioneer, France) and Cromwell (KWS, Germany), which have stability, selection value, stress resistance and high productivity of grain in agro-landscape conditions of the Bryansk region were noted.

COMPARATIVE EVALUATION OF GRAIN PRODUCTIVITY AND ADAPTABILITY OF EARLY SEASON MAIZE HYBRIDS UNDER CONDITIONS OF THE SOUTH-WEST OF BLACK EARTH