再生水、自来水混合灌溉及保水剂施用对饲用甜高粱产草量及品质的影响

摘要

在鄂尔多斯地区,对饲用甜高粱(Sorghum dochna)进行再生水和自来水混合灌溉试验,同时研究在灌水量 75%和50%的条件下施用保水剂(30 kg·hm—2)的影响.通过测定饲用甜高粱的产草量及粗蛋白质含量、中性洗涤纤维含量、酸性洗涤纤维含量、可溶性糖含量,确定再生水、自来水混合灌溉的适宜比例和灌水量.结果表明,正常灌水量75%(+保水剂)下,与纯自来水灌溉处理相比,再生水和自来水以2:1混合灌溉处理的干草产量(26.89 t·hm—2)提高了39.68%,1:1混合灌溉处理的粗蛋白和可溶性糖含量分别提高了9.7%和12.9%,中性洗涤纤维和酸性洗涤纤维含量分别降低了4.8%和7.3%.%Reclaimed and tap water mixed irrigation experiments on feed sweet sorghum(Sorghum dochna) were conducted in the Ordos region.The effect of using a water-retaining agent(30 kg·ha—1)under 75% and 50% of the normal irrigation amount were studied,and the yield,crude protein,neutral detergent fiber,acid detergent fiber,and soluble sugar contents were compared to determine the most efficient ratio of reclaimed and tap water irrigation.The result showed that under 7 5% normal irrigation(+PAM),the yield of sweet sor-ghum(26.89 t·ha—1)was 39.68% higher than that under the ratio of reclaimed and tap water and pure tap wa-ter irrigation of 2:1.Compared with the 1:1 irrigation ratio of reclaimed and tap water with only tap water ir-rigation,the CP and SS contents increased by 9.7% and 1 2.9%,respectively,whereas the NDF and ADF con-tents decreased by 4.8% and 7.3%,respectively.