地下滴灌条件下紫花苜蓿耗水规律试验研究

目的]分析不同水分处理对紫花苜蓿植株高度与生长速度、产量、耗水量及耗水规律的影响关系.方法]通过地下滴灌紫花苜蓿在4种不同水分处理(W1:22.5 mm,W2:30 mm,W3:37.5 mm,W4:45 mm)下产量与土壤含水量的观测试验,得到不同水分处理下紫花苜蓿水分利用效率、耗水量及耗水规律.结果]不同水分处理下紫花苜蓿植株高度与灌水量呈现线性关系,在生育期内不同水分处理对苜蓿植株高度的影响为W4 ＞W3 ＞W2 ＞W1；随着灌水量的增加紫花苜蓿干物质产量呈先升后降的趋势,苜蓿干物质产量与灌水量 存在二维抛物线关系；不同水分处理下紫花苜蓿水分利用效率为W1＞W2＞W3＞W4,从实现紫花苜蓿高产、优质及节水增效的目标出发,紫花苜蓿在地下滴灌条件下,适宜的灌水处理为W3.结论]不同水分处理下紫花苜蓿耗水量随灌水量的增加而增大,在全生育期的耗水量变化规律是由小到大,再由大到小.

Experimental Study of the Water Consumption of Alfalfa Subsurface Drip Irrigation

Objective]The purpose of this project was to research and analyze the effects of different soil water treatments on alfalfa plant height and growth rate,yield,water consumption and water consumption regularity.Method]Through the underground drip irrigation alfalfa in 4 different water treatments,（W₁: 22.5 mm,W₂:30 mm,W₃:37.5 mm,W₄:45 mm ） and the yield and soil moisture observation experiment, the alfalfa water use efficiency and water consumption rule were obtained.Result]Under different water treatments in alfalfa plant,height and irrigation quantity showed a linear relationship.In the growth period of different water disposal on alfalfa plant height the influence order was:W₄>W₃>W₂>W₁;with the increase in irrigation alfalfa dry matter yield increased at first and then decreased,and alfalfa’s dry matter yield and irrigation displayed two parabola relationship;under different water treatments,the sequence of alfalfa water use efficiency was W₁>W₂>W₃>W₄.For the goals of high yield,high quality alfalfa and water -saving efficiency,alfalfa in subsurface drip irrigation condition,the suitable irrigation treatment was W₃. Conclusion]Different water treatments in alfalfa water consumption increased as irrigation quantity increased in the whole growth period,and the water consumption regularity is from small to big,and then from big to small.