Impacts of Soil Water Controlling on Grain Yield and Water Use Efficiency of Spring Wheat under Drip Irrigation
In order to study the impacts of different water controlling on wheat yield and water use under drip irrigation,water control experiments were carried out during three key growth stages :Ⅰ(seedling emergence -joint-ing),Ⅱ(jointing -athesis) and Ⅲ (athesis -milk maturation stage)for spring wheat Xinchun 22 and Xinchun 19. The results showed thatⅡstage was sensitive and key to water controlling .The grain yield and water use efficiency of Xinchun 22 were significantly higher than other treatments when soil water content reached 75% -80%of field rela-tive capacity during Ⅱstage and 65% -70% duringⅠand Ⅲstage,and the highest grain yield and water use effi -ciency reached 6 894.2 kg /ha and 15.824 kg/(mm? ha) respectively.While for spring wheat 19 the highest yield and water use efficiency were achieved when soil water content reached 75% -80% of field relative capacity during every stage,which were 7 409.1 kg /ha and 14.586 kg/(mm? ha).According to soil water consumption ,Xinchun 22 with short stature was a water -saving variety which consumped less water than Xinchun 19 under different water treatments.In addition,the regression analysis of Xinchun 22 and Xinchun 19 presented extremely significant loga-rithmic relationships between water consumption and yield ,and significant linear relationships between water use ef -ficiency and yield with determination coefficient reaching 0.85 and 0.97 respectively.
Spring wheatWater controlDrip irrigationGrain yieldWater use efficiency
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