灌溉量对土壤水分和苜蓿生长的影响

Effects of Irrigation Volume on Soil Moisture and Alfalfa Growth

进行了不同灌溉量对土壤水分和紫花苜蓿生长的影响研究,结果表明,(1)随季节降雨和灌溉量的影响,表层土壤水分含量波动较深层剧烈,1988.67m3/hm2灌溉量处理的土壤含水量能满足植物的正常生长,也不会导致水资源的浪费;(2)2485.84m3/hm2灌溉量处理的植株生长最高,达126.82cm,1491.50m3/hm2灌溉量处理的植株生长高度最低,为104.38cm,1988.67m3/hm2灌溉量处理的植株叶量丰富,茎叶比最小;(3)盛花期刈割时,1988.67m3/hm2灌溉量处理的鲜草产量最高,比2485.84m3/hm2灌溉量处理增产1.21%,比1491.50m3/hm2灌溉量处理增产24.48%。因此,1988.67m3/hm2的灌溉量可使苜蓿叶量丰富、产草量高,并可节约水分,充分利用水资源。

The effects of various irrigation volume on alfalfa growth were studied and the result indicated that：（1）moisture content of surface soil fluctuated severer than in deep soil as influenced by seasonal rainfalls and irrigations.The irrigation treatment of 1 988.67 m3/hm2 best satisfied the normal growth of alfalfa plant,and no water resources were found wasted.（2） irrigations had influence on plant height and leaf-stem ratio,the highest group was 2 485.84 m3/hm2 treatment of 126.82 cm,while the shortest group was 1 491.50 m3/hm2 treatment of 104.38 cm.In 1 988.67 m3/hm2 treatment abundant leaves and leaf-stem ratios was the lowest.（3）when alfalfa was cutted at full flowering stage,1 988.67 m3/hm2 treatment had the highest fresh grass yield,which was higher than 2 485.84 m3/hm2 treatment by 1.21%,and higher than 1 491.50 m3/hm2 treatment by 24.48%.Therefore,the irrigation treatment of 1 988.67 m3/hm2 contributed well on abundant alfalfa plant leaves,high grass yield as well as water saving and full use of water resources.