| A field experiment was conducted in Yuzhong Gansu to elucidate the effects of irrigation amounts and timing on the water consumption characteristics, grain yield, and water use efficiency of oil flax cultivar Longyaza 1. Five treatments were employed in the experiment including no irrigation during the whole growth season (represented as CK), irrigation amount of 80 mm at stem stage (T1), irrigating at stem and full flowering stages with amounts of 60 mm and 40 mm (T2), 80 mm and 40 mm (T3), respectively, and irrigating at stem, squaring and full flowering stages with amounts of 60 mm, 40 mm and 40 mm (T4), respectively. The results showed that dry matter accumulation amount after anthesis and contribution of dry matter accumulation amount after anthesis to grains in irrigation treatments were significantly increased by 91.37% and 45.09%, respectively, in T2. However, over-irrigation significantly reduced the photosynthate and grain yield. Water consumption amount was increased, but grain yield was increased first and then became decreased, and irrigation water use efficiency was decreased significantly. The yield and water use efficiency with T2 treatment were significantly higher than that with other treatments. compared with the CK treatment, it was increased by 40.72% and 11.71%, respectively. In considerations of grain yield, and WUE of irrigation involved in the experiment, the most appropriate irrigation treatment recommended was T2 for water-saving and high-yield, which was to irrigate 60 mm at stem stage and 40 mm at full flowering stage, respectively. |