Arifov M. Adaptivity of varieties and breeding lines of winter bread wheat in connection with the date of sowing

Object: the mechanisms of maintenance of high productivity and quality of a grain winter bread wheat at cultivation under influence of a complex adverse factors of environment. Aim: to develop models of grades winter bread wheat, combining ability to formation of high and stable efficiency at crop in an optimum calendar range with high adaptibility to the conditions of cultivation accompanying a deviation of term of sowing from optimum, and also to define influence of term of sowing on efficiency of carrying out of estimations and selections of a selection material to economic valuable attributes and biological properties.. Novelty: the models of grades with high and stable efficiency at crop in wide ranges of autumn terms was developed, differences between crops of different terms of sowing as selection background for selection of genotypes are determined and theoretically proved on to economic valuable attributes and biological properties. Results: are created models of grades with high and stable efficiency at crop in wide ranges of autumn terms in conditions of southern steppe of Ukraine, the comparative estimation of efficiency of use of crops of different terms of sowing as background for purposeful selection of a selection material to economic valuable attributes and biological properties. Application stage: the valuable lines allocated during research to selection with a complex of useful attributes are used in selection process in research establishments of Ukraine. Application area: research establishments of UAAS