圆形喷灌机条件下变量灌溉对苏丹草产量与品质的影响  

Effects of variable rate irrigation on sudangrass yield and quality under center-pivot irrigation

作　　者：孙宇 李茂娜 王云玲[1] 严海军[1] SUN Yu;LI Maona;WANG Yunling;YAN Haijun(College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China)

机构地区：[1]中国农业大学水利与土木工程学院,北京100083

出　　处：《干旱地区农业研究》2020年第4期32-38,共7页Agricultural Research in the Arid Areas

基　　金：河北省现代农业产业技术体系草业创新团队专项(HBCT2018160202)。

摘　　要：以苏丹草为研究对象,于2019年5—8月在河北涿州中国农业大学教学实验场开展了圆形喷灌机条件下变量灌溉对苏丹草产量与品质的影响研究。依据土壤表观电导率(ECa)差异划分出3个灌溉管理小区(1区、2区、3区),并分别对其进行变量灌溉(VRI)和均匀灌溉(URI)处理。结果表明:全生长季内,URI和VRI处理之间年产量没有显著性差异(P>0.05),但VRI处理比URI处理节水13.4%,灌溉水分利用效率提高了17.5%,尤其是在第二茬雨季VRI处理的灌溉水分利用效率提升了43.8%(P<0.05);第一茬,VRI处理与URI处理苏丹草粗蛋白含量与相对饲喂价值没有显著性差异(P>0.05),但在降雨量较大的第二茬VRI处理可以显著提高苏丹草的粗蛋白含量(提高9.5%,P<0.05)和相对饲喂价值(提高3.5%,P<0.05)。From May to August 2019,a study on sudangrass with a center-pivot system to assess the effects of variable rate irrigation(VRI)on the yield and quality was conducted at the experimental station of China Agricultural University in Hebei Province.Three management zones(zone 1,zone 2,and zone 3)were delineated according to the difference of soil apparent electrical conductivity(ECa),and treated them with VRI and uniform rate irrigation(URI),respectively.The results showed that there was no significant difference in the annual yield between URI and VRI management(P>0.05),but VRI saved 13.4%water and increased the IWUE by 17.5%than URI did.Especially,for the second cutting in rainy season,the IWUE of VRI increased significantly by 43.8%(P<0.05).In the first cutting,VRI had no significant effect on the crude protein(CP)contents and relative feeding value(RFV)of sudangrass(P>0.05).But,in the second cutting,VRI significantly increased the CP by 9.5%and RFV by 3.5%(P<0.05).

关 键 词：变量灌溉 苏丹草 产量 品质 圆形喷灌机 

分 类 号：S275.5[农业科学—农业水土工程]