非充分灌溉对冬小麦产量及水分利用效率影响研究

通过田间试验,研究冬小麦在不同生育期缺水以及不同程度的缺水对其生长发育及产量的影响,为半干旱区冬小麦建立优化灌溉制度提供理论依据。通过试验观测:枯水年份,冬小麦各生育期耗水比例相差较大,0~80cm土层的耗水量占总耗水量的绝大部分,总耗水量随灌水量的增加而增大,非充分灌溉对冬小麦叶面积、产量和水分利用率均会产生显著影响,灌水可显著提高植株叶面积,不灌水会显著降低作物产量与耗水量;灌1水的灌溉水利用效率明显高于灌2水和灌3水的灌溉水利用效率,其中以T2处理的灌溉水利用效率最高,边际效益最大;灌冬浇水与拔节水可获得较理想的产量和水分利用效率,在半干旱区水资源不足时,可作为冬小麦最佳灌水模式。

Study on the Effects of Deficit Irrigation on the Yield and Water Use Efficiency in Winter Wheat

Through field experiment,of water and water in different degrees of Winter Wheat Research It has studied the influence on its growth and yield in different growth stages and varying degrees of water shortage,aims to establish the optimized irrigation sys-tem for winter wheat in semi-arid regions.Through the observation on the winter wheat growing period,the results showed that the proportion of water consumption was very large in different growing periods,water consumption in 0~80 cm soil accounted for the vast majority of total water consumption,the total water consumption increased with the irrigation amount,the leaf area,yield and water use efficiency had significant impacted by deficit irrigation,plant leaf area had significantly increased by irrigation and the yield and water consumption could significantly reduced by no irrigation.The water use efficiency was higher than 2 and 3 times irrigation When 1 time irrigation,among which T2 the highest irrigation water use efficiency and marginal benefit;The good yield and water use efficiency can be obtained by irrigation in winter and jointing stage,it can be regarded as the best irrigation mode for winter wheat.Which is the When the water resources are insufficient in the semi arid area.