Agriculture and forestry

Mazur Viktor − Candidate of Agricultural Sciences, Professor of the Department of Plant Growing, Selection and Bioenergetic Cultures, leading researcher, Rector of the Vinnytsia National Agrarian University, Vice- President of ESPC Ukrainian Scientific -Educational Consortium (21008, Vinnytsia, Soniachna Str.3, е-mail: rector@ vsau. org).

Kolisnyk Oleh − Сandidate of Agricultural Sciences, Associate Professor of the Department of Botany, Genetics and Plant Protection, Vinnytsia National Agrarian University (21008, Vinnytsia, Soniachna St. 3, e-mail: ooov@i.ua ).

The article covers an experimental field study of scientific issues - increasing the yield of sunflower seeds by optimizing the basic elements of cultivation technology. The research was carried out in the period 2020-2021 in the research field of VNAU on the basis of NDG "Agronomichnenske", which is located in the village of Agronomichne Vinnytsia region. Two hybrids of early-ripening sunflower maturity Integral and Slavson were studied in the studies of row spacing and sowing density. To achieve this goal used field, laboratory, statistical and computational methods. The quality of the harvest and its structure, the efficiency of the use of environmental resources were determined by the laboratory method. The reliability of the obtained research results was assessed by a statistical method. The economic efficiency of the studied elements of the technology was determined by the calculation-comparative method. It was found that when sowing sunflowers with a row spacing of 45 cm, the growing season of the hybrid Integral is 108 days, and the hybrid Slavson - 95 days. With a row spacing of 70 cm, the vegetation of plants of both hybrids is reduced by 2-6 days. It was observed that with the thickening of crops from 50 to 90 thousand / ha, the plant height of the hybrid Slavson increases from 179.1 to 190.4 cm, and the hybrid Integral from 184.1 to 196.9 cm. Larger weight of 1000 seeds was provided by the early-ripening hybrid Integral with a row spacing of 70 cm and a sowing density of 50 thousand plants / ha - 72.6 g, and the lowest value of this indicator was at a density of 90 thousand plants / ha - 56.1 g. Sunflower yield depends on structural elements such as number of inflorescences per unit area, number of seeds per inflorescence, average weight or weight of 1000 seeds, and seed quality is mainly determined by fat and protein content. We state that the optimal sowing density of hybrids Integral Slavson and for sowing with a row spacing of 45 and 70 cm was - 70 thousand / ha. Higher seed yield for sowing 70 cm was provided by the hybrid Integral - 2.72 t/ha.

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