Effects of drought stress treatments on potato growth characteristics,tu-ber yield and water use efficiency at different growth stages
In order to explore the response of potato to drought stress at different growth periods and clarify the water demand characteristics of potato at each growth stage,this study used the potato cultivar Huasong 7 as the test material to carry out drought stress treatments at each growth stage of potato under the field canopy.The effects of drought stress on plant growth,dry matter accumulation,tuber yield and water use efficiency at different growth sta-ges were studied.The results showed that the plant height,root length,dry matter accumulation and water use efficiency of potato at the mature stage were significantly increased under drought stress treatment at seedling stage(T1).In terms of yield and yield components compared with control,the rate of big tuber under T1,treatment was significantly increased by 11.00 percentage points,the rate of small tuber was significantly decreased by 10.34 percentage points,and the yield of tuber was significantly increased by 31.34%.Tuber yield under drought stress treatments at tuber formation stage(T2)and tuber expansion stage(T3)was significantly decreased by 58.41% and 27.84%compared with control.The rate of large tu-ber under T2 treatment was significantly decreased by 25.34 percentage points compared with control,but there was no sig-nificant difference in the rates of large tuber,medium tuber and small tuber between T3 and control.Drought stress treat-ment at starch accumulation stage(T4)had no significant effect on dry matter accumulation per plant,tuber yield and yield components compared with control.Therefore,appropriate drought stress treatment can be applied to Huasong 7 at seedling stage to improve tuber yield and water use efficiency,while in the period of tuber formation and tuber expansion,sufficient water supply should be maintained to ensure the formation of tuber yield,so as to achieve high yield and high efficiency.
potatodrought stressgrowth characteristicstuber yieldwater use efficiency
万方数据
维普
