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The paper presents results of agroecological assessment of adaptive ability and grain yield of mid-early corn hybrids on gray forest soils of Bryansk high plains. The study and assessment of grain yield of mid-early corn hybrids of domestic and foreign selection were carried out on the basis of the experimental field of Bryansk State Agrarian University in the period of 2016-2019. The aim of these studies was to study the adaptability parameters and the features of formation of highly productive agrocenoses of mid-early (FAO 201-300) corn hybrids for grain in the agrolandscape conditions of Bryansk region. The object of the research was 19 hybrids of the middle early group (FAO 201-300). The following tasks were solved in the course of the study: to conduct an agroecological parameter assessment of the adaptive ability of mid-early corn hybrids applying the generally accepted parameter of “yield”; to substantiate the features of formation of highly productive corn crops in grain cultivation technology in the agro-climatic conditions of the region. Parameters of ecological plasticity, stress resistance, homeostaticity, selection value were calculated. As a result of the experiments, the average corn grain yield varied from 6.07 t / ha of Ronaldinio hybrid of the KWS selection (Germany) to 8.29 t / ha of Voronezh 279 SV hybrid (Voronezh branch of the All-Russian Research Institute of Maize). The indexes of environmental conditions (Ij) within the years of research varied from - 0.2 to +0.8: the most favorable conditions for formation of high yield of corn grain appeared in 2018, and on average, 7.72 t / ha was obtained in the experiment. Such genotypes as Ronaldinio (KWS, Germany), P 8523 (Pioneer, France), DKS 2960 (Monsanto, Switzerland), Pterox (RAGN Semences, France) were noted with high parameters of homeostaticity, selection value and variation coefficient low values. High parameters of adaptive ability were identified in hybrids of domestic selection of Voronezh 279 SV, Ladoga 221 MV and foreign selection - Ronaldinio (KWS, Germany), P 8523, P 8816 (Pioneer, France) and DKS 2960 (Monsanto, Switzerland), which possessed stability, selection value, stress resistance and high grain yield in the agrolandscape conditions of the region.

ADAPTIVE AND PRODUCTIVE POTENTIAL OF MID-EARLY CORN HYBRIDS FOR GRAIN IN AGROLANDSCAPES CONDITIONS OF BRYANSK REGION