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INTRODUCTION Identification of corn genotypes by adaptability parameters should be performed according to the results of tests in an ecological gradient, which is formed by the means of agrotechnical measures and, as far as possible, most fully reflects the range of agroclimatic conditions of possible genotype propagation. The most informative quantification can be obtained on the basis of regression models and variance methods. Modern agro-economic conditions require a wide range of corn genotypes that have specific .adaptability to soil-climatic and technological factors. In recent years, a number of the hybrids have been created at the Institute of Irrigated Agriculture of NAAS, which are characterized by a wide range of vegetation periods duration and adaptability to agro-economic conditions. However, one of the problematic issues in crop production remains a considerable variation in genotype yields under different cultivation conditions. In the conditions of southern region of Ukraine, the main factor of the yield limitation is moisture. However, the use of optimal irrigation regimes has become economically unavailable for many farms due to high energy costs. That is why the development of water-saving technologies for corn cultivation has become the prerogative of research in the scientific institutions in southern region.

PRODUCTIVITY AND ADAPTABILITY INDICES OF CORN HYBRIDS OF DIFFERENT GROUPS OF RIPENING