Effects of Growth Regulators on the Photosynthetic Activity of Winter Wheat

This study investigated the effects of growth regulators and a reference fungicide on the photosynthetic activity and dry biomass accumulation of winter wheat. Field experiments conducted in 2020–2022 in the Uzgen district of Osh region demonstrated that Zircon and Superstim significantly enhanced net photosynthetic productivity and leaf area index. The fungicide Kolosal Pro provided the highest efficiency in protecting the assimilation apparatus from leaf diseases and extending its functional activity. The findings suggest that the application of biologically active substances is an effective approach to stabilize winter wheat yield under arid climatic conditions of Kyrgyzstan.