Screening and monitoring of watermelon source material by components of the vegetation period in the conditions of the forest-steppe of Ukraine

Relevant in the selection of each crop, including watermelon is a comprehensive study source material to identify sources valuable traits and include them process order expand genetic diversity culture. According results research, create new for heterosis watermelon, screening monitoring vegetation period duration (number days from germination ripening) its components 118 (101 varieties, 17 hybrids) genotypes forest-steppe Ukraine have been conducted. Research methods are generally accepted: field experiment, observation, accounting, analysis, statistical. determining period, samples were divided into five groups ripeness: early (65–80 days) – 80 (68 %), medium-early (81–85 14 (12 medium (86–95 18 (15 medium-late (96–105 4 (3 %) late (106 2 (2 %). Variety-samples, selected by morphological economically characteristics, belong mainly (80 medium-early. Only 6 % late-ripening groups. 52 with smallest separate interphase periods isolated. 8 high ripeness identified, which was 66–70 days: Yellow 108105 (66 days), Karapuz 108109, Surprise 108121 (67 Gift sun Lezheboka honey 108116, Thailand №1 108153 ( 69 Sweet Diamond 107874, Northern Lights 108127 (70 days). Sources involved