MAIN PERIODS OF GROWTH AND DEVELOPMENT OF F1 CUCUMBER HYBRIDS AND THEIR YIELDS DEPENDING ON WEATHER

Purpose. To evaluate effects of weather on growth and development cucumber plants, lengths the main interphase periods, yield Left-Bank Forest-Steppe Ukraine; to select breedingvaluable genotypes for heterosis breeding under climatic changes. Methods. Field, analytical, measuring, statistical. Results. The study was conducted outdoors at Institute Vegetable Melon Growing NAAS in 2019–2020. years varied significantly, allowing us assess its influence phenological processes plants. Summarizing results, we established that sufficiently high average daily air temperature (25.3–25.8 °С), a large amount unevenly distributed precipitation (0–104 mm), with little or no during certain phases development, significantly affected growing period length hybrids investigation. We found onset mass anthesis female flowers did not vary across years, averaging 33–36 days. (35 days check accession). Fructification started day 37–40 2019 42–45 2020, which 4–6 later. lasted 32–40 20–24 12–16 longer. Analysis dynamics over showed more favorable Thus, 2019, total yields ranged 20.8 t/ha 64.9 t/ha. In temperatures low humidity, 12.7–26.9 t/ha, lower (by 41.4–61.0 %). Conclusions. reflected climate instability Ukraine. periods hybrid plants their were revealed variable conditions. selected annual parameters would be valuable further breeding: by early ripeness – F1 ‘BD 96-18’ / ‘Tsezar’, ‘RD 96 2-95’/ ‘Dzherelo’, 2-95’ ‘Heim’ ‘Mah-62’ ‘Toma-18’ (42 days); fructification 2-95’/‘Dzherelo’ days), ‘Toma-18’, 96-18’/ 2-95/‘Heim’ (32 capacity (45,9 t/ha), (39,3 ‘Krak’ ‘RD-96 (36,8 (35,8 (34,6 ‘Dzherelo’ (34.2 t/ha). yielded than ‘Ajax’ 80-142 % 19.0