Effects of different drip irrigation treatments on the growth and photosynthetic characteristics of quinoa
[Objective]Explore the effects of different irrigation periods and amounts on the growth and photosynthetic characteristics of quinoa in the northern foothills of the Yinshan Mountains,to determine the reasonable irrigation system for quinoa in the area.[Methods]In Wuchuan Dry Farming Experiment Station in Inner Mongolia,6 drip irrigation treatments,W1(irrigation in the seedling stage + branching stage),W2(irrigation in the seedling stage + heading stage),W3(irrigation in the seedling stage + filling stage),W4(irrigation in the seedling stage + branching stage + heading stage),W5(irrigation in the seedling stage + branching stage + filling stage),and W6(irrigation in the seedling stage + heading stage + filling stage)were set up.The plant dry matter accumulation dynamics,leaf area index,changes in photosynthetic characteristics and crop yield effects of quinoa during the growth period were monitored.[Results]During the entire growth period of quinoa,dry matter accumulation and leaf area index showed upward trends with the increase of drip irrigation amount.The leaf area index of W5 treatment increased by 45.00%compared with W1 treatment in the filling stage.During the flowering stage of quinoa,the leaf photosynthetic rate,transpiration rate and stomatal conductance had downward trends as the drip irrigation amount increased,but some levels of deficit irrigation could significantly improve leaf water use efficiency.The leaf water use efficiency of W5 treatment significantly increased(P<0.05)by 39.04%compared to W1 treatment.There were significant differences in the yield of quinoa under different drip irrigation treatments.W5 treatment had the highest yield of 2245.60 kg/hm2,which was significantly increased(P<0.05)by 78.68%compared to W1 treatment.[Conclusion]In the northern foothills of Yinshan Mountains,irrigation with a total volume of 1 350 m3/hm2 during the seedling,branching,and filling stages of quinoa improved water use efficiency and achieved high yield.
QuinoaDrip irrigationPhotosynthetic characteristicsYieldNorthern foothills of Yinshan Mountains
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