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The results obtained during observations of the growing season of pea collection varieties in different years in terms of interphase periods are presented. The dependence of the growing season length for varieties of various maturity groups on the duration of certain phases of plant growth (seedling, flowering, ripening), ambient environment (temperature, humidity, daylight hours), processing (seed preparation, line production maintenance) and genetic factors (sequential node of the first inflorescence formation) are shown. According to the study results the varieties-sources of «growing season length» characteristic were specified that have been used as components for breeding in the selection process when creating new domestic varieties.

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