Abstract:In order to promote the growth of sunflower and improve the yield and water use efficiency of sunflower, five irrigation quotas were set. The five treatments were 300m3/hm2, 375m3/hm2, 450m3/hm2, 525m3/hm2 and 600m3/hm2, respectively. The effects of different irrigation quotas on plant height, leaf number, disk diameter and stem diameter of edible sunflower were analyzed and compared. The relationship between growth index of edible sunflower and yield and water consumption under different irrigation quotas was explained. The ability (potential) of different irrigation quotas to increase yield and water use efficiency of edible sunflower was analyzed by time series dynamic evaluation model. The results showed that the plant height, leaf number, disk diameter and stem diameter of sunflower were increased with the increase of irrigation quota. The treatments with 525m3/hm2 and 600m3/hm2 irrigation quota promoted the growth of sunflower growth index significantly. When the irrigation quota was increased to 600m3/hm2, the stem diameter of sunflower was not increased but decreased, and 300m3/hm2 irrigation quota limited the growth of sunflower plants. High irrigation quota was more conducive to the growth of plant height and leaf number of sunflower. There was a positive relationship between sunflower growth index and yield and water consumption. Water consumption and yield were increased with the growth of sunflower plants. Under 525m3/hm2 irrigation quota, sunflower plants grew well, consumed more water and had higher yield. Irrigation quota of 600m3/hm2 increased nutrient growth time and water consumption of sunflower, which was not conducive to yield increase of sunflower. In reproductive growth stage, the water consumption of sunflower under 525m3/hm2 and 600m3/hm2 irrigation quota was high, and the reduction of plant height and stem diameter was large. The evaluation results showed that the comprehensive growth of sunflower under 300m3/hm2 irrigation quota was at a disadvantage, and the ability to improve yield and water use efficiency was weak, that was, the potential was small. The sunflower under 525m3/hm2irrigation quota had the best comprehensive growth potential. The 525m3/hm2 irrigation quota was suitable for the actual sunflower irrigation system. The time series dynamic evaluation model can better solve the problem of field test evaluation, and provide a reference for comprehensive analysis of field test based on dynamic and static indicators.
