EFFICIENCY OF DIFFERENT ROOTSTOCK FOR WATERMELON YUKON F1 HYBRID IN THE CONDITIONS OF THE LEFT BANK FOREST STEPPE OF UKRAINE
The aim of the research. Study of growth, development and productivity of Yukon watermelon hybrid depending on the rootstock in the conditions of the Left Bank Forest-Steppe of Ukraine. Methods. Field - determination of the harvest; phenological observations and biometric measurements; mathematical and statistical - statistical processing of experimental results. Results Based on the results of research conducted in 2019-2020, the watermelon hybrid Yukon F1, depending on the rootstock, formed different biometric indicators of the plants, which changed depending on the rootstock and had an impact on yield. Biometric measurements for two years of observation allowed establishing a noticeable difference between grafted and nongrafted watermelon plants. Grafted plants provided a greater vegetative mass of plants - the number of leaves on the Cobalt rootstock is 169 more, and on the Pelops rootstock is 149 more than on the control plants. The length of the main stem in grafted watermelon plants on Cobalt rootstock is 70.5 cm longer and grafted on Pelops rootstock is 62.0 cm longer than in control, non-grafted Yukon F1 watermelon hybrid plants. Shoots of the first and second order were the most in the grafted plants on the Cobalt rootstock, 17 more than in the control. During the two years of testing, the grafted watermelons obtained a higher yield, so grafted onto the Cobalt scion was 17.7 t/ha higher than the control, and on the Pelops scion by 14.5 t/ha, respectively. Conclusions. The conducted studies indicate the expediency of using various rootstocks for watermelon in the conditions of the Left Bank Forest Steppe of Ukraine. Grafted watermelon plants formed a more powerful root system and vegetative mass, when grafted on Cobalt rootstock 78% more than on control, and 68% more on Pelops rootstock, respectively. Vaccination provides a significant increase in yield relative to control, both when obtaining early products by 24-32% and the total yield by 25-30%. The feasibility of using grafted plants in modern growing conditions has been proven. Proposed ways to increase the yield due to the use of grafted watermelon plants on various rootstocks.
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