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为了研究不同滴水量对苜蓿生长发育及产量的影响,试验以新牧4号紫花苜蓿为研究材料,在滴灌条件下设置全生育期总滴水量3 600 m3/hm~2(W1)、4 200 m3/hm~2(W2)、4 800 m3/hm~2(W3)、5 400 m3/hm~2(W4)4个处理,并测定株高、枝条数、分枝数、产草量等指标。结果表明:苜蓿第一茬草W3滴水量的枝条数最多,单株叶重最重,分枝数最多;苜蓿再生草不同滴水量之间株高差异不明显;第二、三茬草中分枝数最多为W3,W3的茎粗、单茎重、单株叶重均最大;第一茬苜蓿干草产量以W3最高,第二茬苜蓿干草产量W3居第二,第三茬苜蓿干草产量最高的是W3,从苜蓿全年的生物产量看,W3的产量最高,达到27 273.5 kg/hm~2,高于平均值3 543.6 kg/hm~2。说明W3滴水量为塔里木垦区苜蓿最佳滴水量。
In order to study the effects of different drip rates on the growth and yield of alfalfa, the experiment was conducted with Xinmu No.4 alfalfa as the experimental material. Under the drip irrigation conditions, the total drip irrigation amount was 3 600 m3 / hm2 (W1) and 4 200 The plant height, branch number, branch number, grass yield and so on were determined by four treatments (m3 / hm ~ 2 (W2), 4 800 m3 / hm ~ 2 (W3) and 5 400 m3 / hm ~ 2 index. The results showed that W3 had the highest number of shoots, the heaviest leaf weight per plant and the highest number of branches in alfalfa. The difference of plant height between different drip irrigation rates was not obvious. The stems with the largest number of branches were W3 and W3, the stem weight was the highest, and the leaf weight per plant was the largest. The first crop had the highest W3 of hay yield, the second crop of W3 with the second crop of hay, the third highest yield of alfalfa hay W3. According to the annual biological yield of alfalfa, the yield of W3 is the highest, reaching 27 273.5 kg / hm ~ 2, higher than the average of 3 543.6 kg / hm ~ 2. Description of W3 drip irrigation Tarim Basin optimal drip amount of alfalfa.