“Зарафшон” ғўза навида муқобил агротехнологияни такомиллаштириш

The conditions and norms of application of the new UzDEF and PoliDEF defoliants depending on irrigation regimes and timing of cotton “Zarafshon” in moderate loamy soils with shallow-gray, groundwater depths of 7-8 meters in Samarkand region. According to the data obtained, there is a direct impact on the efficiency of defoliants used in the experimental field as a result of the different effects of irrigation procedures and timing periods on plant growth and development.