Features of the formation of highly productive crops of a new sunflower hybrid Fogor

Influence of seed sowing rates (40, 60 as control and 80 thousand seeds/ha) on productivity of sunflower hybrid Fogor was studied on leached black soils of the Western Ciscaucasia (Korenovsk district, Kranodar region) in 2022-2023. It is established the highest seed (3.62 t/ha) and oil (1.46 t/ha) yields are reached at the seed-sowing rate of 80 thousand seeds/ha under sufficient moisture supply. Under weather conditions of 2022-2023, the less prevalence of bacteriosis (by 2 and 13%) and rust (by 6 and 8%, respectively) in the crops were observed. In 2023, population of fungal micoflore in rhizosphere was high enough (5.5 × 104 CFU/g), at the control level (5.7 × 104 CFU/g), the most was presented by saprophyte fungi from genera Penicillium (55.3% of the total fungi amount) and Aspergillus (25.4%). But the share of pathogenic fungi was less significantly: Fusarium spp. - 4.5%, Rizopus spp. - 0.8%. Consequently, the highly productive crops of the new sunflower hybrid Fogor is formed under sufficient water supply at the seed-sowing rate of 80 thousand seeds/ha.