Nargan T. Effect of the vegetation period duration on agronomically important traits of winter bread wheat cultivars and lines in the South of Ukraine

Object: varieties, hybrids from crossing between geographic compartment forms, lines with different duration of some phases of winter bread wheat. Aim: the dependence of vegetation period duration from some ontogenesis stages and its effect on form of winter wheat agronomic important properties. Novelty: for the first time necessity of different approach to watch of spring-summer vegetation stages of winter bread wheat was proved. Results: the modification of vegetation period duration is the result of decreasing and more variability of spring vegetation renewal was determined; the selection result on different selection stages for property "period duration emergence growth - ear" was founded; the vegetation period duration and its some phases have effect on resistance to diseases, frost-, winter-resistance, seeds productivity and quality was showed; the variety model with optimal growing temps on some ontogenesis stages was developed. Application stage: winter wheat varieties Bagryana and Zaporuka were created with co-authors. Application area: scientific establishments of UAAS and AIC of Ukraine.