The effectiveness of biological preparations on sunflower in Novosibirsk Region

Sunflower is an important oil crop for the Novosibirsk region. However, it is very susceptible to various diseases that can lead to a decrease in the quantity and quality of the harvest, weakening of the plants and their death. The use of biological preparations to stimulate plant growth and protect plants from pathogens is relevant in conditions of pesticide stress in agroecosystems. The purpose of the research is to evaluate the effectiveness of pre–sowing seed treatment with biological preparations on sunflower in the conditions of the Novosibirsk region. The tasks included conducting field tests on the effect of biological preparations on morphometric parameters: plant height, number of leaves, diameter of capsules, weight of 1000 seeds, biological effectiveness of preparations in reducing the prevalence of diseases of sunflower capsules. As a result of studies conducted in 2023–2024 on the grounds of the Novosibirsk State Agricultural University’s «Michurintsev Garden» it was found that the biopreparation Fitop 8.67 based on the bacteria Bacillus amyloliquefaciens and B. subtilis and the bacterial-humic complex AFG had a growth-stimulating effect on sunflower variety «Yenise». It was found that the Fitop 8.67 contributed to an increase in plant height (by 1.4 times) compared with the control during the initial growth period. The weight of capsules increased by an average of 24.0 % (Fitop 8.67) and 11.8 % (AFG) in 2 years. The biological effectiveness of biological products in reducing the prevalence of the capsular form of white and gray rot was 46.9 % and 41.6 %. The obtained data may be of interest for the development of sunflower cultivation technologies in organic, environmentally friendly and integrated farming systems.