| The objective of the experiment was to investigate the effect of soil moisture on growth parameters of sunflower. Field experiments were conducted in Agro-meteorological Institute of Bayannaoer with different irrigation regimes. Results indicated that the significant effect of irrigation on sunflower growth. At seedling stage deficit and wet irrigation resulted in lower plant height, leaf area, dry matter accumulation. Crop compensation is obvious after deficit treatment. However, all growth parameters were reduced. Sufficient irrigation later can minimize the loss. In early stage drought postponed the date of maximum leaf area. In the late stage, soil moisture affected decreasin
g rate of leaf area. Accumulation of dry matter and soil moisture were significantly correlated.. Period from budding to one week flowering is critical for sunflower in term of water requirement, with soil moisture of 70%～90% being suitable. And after that until maturity, soil moisture should be 55%～70%. |