Agriculture and forestry

Vdovenko Serhiy Anatoliyovych – Doctor of Agricultural Sciences, Professor of the Department of Plant Production and Horticulture, Vinnytsia National Agrarian University (21008, Vinnytsia, 3 Sonyachna Street. e-mail: sloi@i.ua).

Yevhenii Oleksandrovych Serbin – graduate student of the Department of Plant Breeding and Horticulture of the Vinnytsia National Agrarian University (21008, Vinnytsia, 3 Sonyachna Street. Email: Ap.nt1982@gmail.com).

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The article evaluates different terms of planting Brussels sprouts seedlings for their productivity in the forest-steppe of the right-bank Ukraine. The research was conducted during 2023-2024 in open ground conditions using hybrids Brilliant F1, Dolores F1, Diablo F1 and varieties Rosella and Cassiopeia. Cabbage seedlings were planted in a row method according to the scheme of 70x50 cm in the II and III decade of May, I decade of June. Plants of the Rosella variety and the Diablo F1 hybrid were chosen as a control, which were planted in the second decade of May. Evaluation of the effectiveness of different terms of planting seedlings was carried out on the basis of plant biometrics and determination of the total yield and quantitative indicators of the crop. Studies have shown that the term of planting seedlings affects the biometrics of Brussels sprouts. Planting seedlings in the second or third decade of May contributes to the formation of a larger number of leaves on the plant, and a slightly smaller number of leaves is obtained when planting seedlings in the first decade of June. In open ground conditions, the plants of Cassiopeia variety (28.6-29.6 pcs.) and Dolores F1 hybrid (26.4-26.6 pcs.) were characterized by a larger number of leaves when planting seedlings in the second and third decade of May. The average weight of the head when planting seedlings in the II and III decade of May is the largest in the variety Cassiopeia (6.9-7.2 g) and in the hybrid Dolores F1 (7.0-7.2 g), and the diameter of the head and the number of heads per plant increases. Planting Brussels sprout seedlings in the first decade of June helps to obtain the smallest head weight for the Rosella variety and the Brilliant F1 hybrid. Summer planting of seedlings in the first decade of June does not contribute to an increase in the weight of the head of the hybrid Brilliant F1. Planting Brussels sprout seedlings in the second or third decade of May of the Dolores F1 hybrid increases the yield to 10.6 and 11.6 t/ha, and in the Cassiopeia variety, the total yield increases by 25 or 34%, respectively. The planting date of the third decade of May has a positive effect on the yield of Brilliant F1 cabbage, where it increases by 1.5 t/ha. Spring planting dates for seedlings help to increase the marketability of Brussels sprouts. The maximum yield of 92 % was obtained for the Cassiopeia variety when planting seedlings in the second or third decade of May and for the Brilliant F1 hybrid when planting seedlings in the second decade of May. The optimum value of the Levis stability coefficient is characterized by the Brilliant F1 hybrid for planting in the second decade of May, the Diablo F1 hybrid for planting seedlings in the third decade of May and the Dolores F1 hybrid for planting seedlings in the first decade of June.

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