Quality parameters of sunflower line seeds depending on different agricultural practices in the seed-production plot

The research was carried out in 2024–2025 at the farm "Urupskoye" on the typical cherno-zem in the Western Ciscaucasia. The object of research was the sunflower line CMS VK 101-sur A, which is the maternal form of a new hybrid Lavrus. The aim of the work was to study the effect of agricultural prac-tices on plant growth and development, yield and sow-ing quality of seeds produced on the seed-production plot of the line. In very dry weather conditions (HTC = 0.45) of sunflower growing season in 2024, agricul-tural practices and seeding rates had no significant ef-fect on the duration of interphase and growing season of plants. According to phytopathological records, the manifestation of plant diseases was weak in conditions of water deficiency and high average daily air temper-atures. Seeding rate of 65 thousand pcs/ha in the vari-ant with the use of fertilizers and means of chemical plant protection against diseases provides high yield (0,72 t/ha). On the basis of the researches carried out in 2025 it was found out that the use of biological plant protection agents contributes to obtaining seeds of sun-flower line with high indicators of germinative energy (72–95%) and laboratory germination (93–98%). As a result of the conducted research, it can be concluded that the applied technological methods at the seed-pro-duction plot of the maternal line of sunflower VK 101-sur A are scientifically justified and effective for the production of seeds with high germinative energy and laboratory germination.