灌水频率对河套灌区密植玉米产量及水分利用效率的影响OA

[Objective]Sandy soils have high hydraulic conductivity and low water-holding capacity,making irrigation management essential for achieving high and stable crop yields in such soils.Here,we experimentally investigated the effects of irrigation frequency under mulched drip irrigation on growth,water-use efficiency(WUE),and yield formation of densely planted spring maize in sandy soils of the Hetao Irrigation District.[Method]The experiment was conducted in a spring maize field with a total irrigation amount of 6 000 m3/hm2,applied at three irrigation frequencies:20 events(W1),15 events(W2),and 10 events(W3).Conventional irrigation practiced by local farmers,with an irrigation amount of 6 375 m3/hm2,was used as the control(CK).During the experiment,we measured plant height,leaf area index(LAI),dry matter accumulation,water consumption,WUE and grain yield.[Result]Under the moderate irrigation frequency(W2),plant height and LAI reached their highest values at the grain-filling stage,at 297.67 cm and 2.62,respectively.W2 showed the best overall performance in WUE,dry matter accumulation,and grain yield.Compared with CK,W2 increased WUE and promoted dry matter accumulation,resulting in a grain yield of 19 820.09 kg/hm2,the highest among all treatments.[Conclusion]Under densely planted spring maize in sandy soil,applying 6 000 m3/hm2 of irrigation water in 15 events improved soil water availability,promoted plant growth and canopy development,enhanced dry matter accumulation,and increased WUE and grain yield.Thus,W2 was the optimal irrigation strategy for densely planted spring maize under mulched drip irrigation in the sandy soils of the Hetao Irrigation District.