The effect of the “Costando, KE” growth regulator on the productivity of winter wheat

Relevance . The ability to manage the agrocenoses of winter wheat during the growing season, especially with biological preparations, is an important link in modern crop production. From the point of view of ecology and the stability of gross winter wheat harvests in a changing climate, this is especially in demand by agricultural producers. Methods . The experiments were conducted in 2021/24 agricultural years in the conditions of the Azov zone of the Rostov region. The objects of research are winter wheat of the Stanichnaya and Lydia varieties, and the growth regulator “Costando, KE” (Trinexapac-ethyl) for the vegetation of the crop. Results . The positive effect of the “Costando, KE” biopreparation on the survival of wheat plants for harvesting (+8–9%), productive and general bushiness (+13–22%), ear length (+1.1–1.2 cm), yield (+24–25%) and resistance to lodging (4 and 5 marks), as well as reducing the length of the internodes and thickening the stem (+0.1–0.5 mm). Fractional application of “Costando, KE” (0.2 + 0.2 l/ha) in vegetation showed the best results in terms of cumulative effect in the agrocenosis. The highest yield was obtained with the fractional use of the “Costando, KE” growth regulator (0.2 + 0.2 l/ha) 5.09 t/ha for Stanichnaya and Lydia varieties, respectively.