草业学报2019，Vol.28Issue(2)：41-50,10.DOI:10.11686/cyxb2018231
水氮供应对地下滴灌紫花苜蓿生产性能及水氮利用效率的影响
Effects of water and nitrogen supply under drip irrigation on the production performance rate and water and nitrogen use efficiency of alfalfa
摘要
Abstract
The effects of water and nitrogen supply on the growth, yield and water and nitrogen use efficiency of alfalfa were investigated to find out the best combination of water and nitrogen in the production of alfalfa and to provide scientific reference data for actual production under drip irrigation in the Yellow River irrigation region of Ningxia.A field experiment using a split-plot design was used.There were four irrigation levels (W1, 480mm;W2, 550mm;W3, 620mm;W4, 690mm) in main plots and four nitrogen levels (N0, 0;N1, 60kg·ha-1;N2, 120kg·ha-1;N3, 180kg·ha-1) in sub-plots.The results showed that water and nitrogen supply had different effects on the plant height and stem diameter of alfalfa for each harvest.The plant heights of first and second cutting of alfalfa increased with increased nitrogen application rate and with increased irrigation supply, and the stem diameter at the first cutting was increased with increased irrigation rate.The yields of alfalfa hay at the first and second cutting increased with increased irrigation rate.Applied nitrogen significantly increased the alfalfa hay yield at the first and fourth cuttings and over the whole growth season.The irrigation effect, the nitrogen application effect, and the irrigation and nitrogen interaction for hay yield were all extremely significant (P＜0.01).The irrigation water use efficiency (IWUE) and water use efficiency (WUE) were decreased with increased irrigation rate, and were increased by nitrogen application.The treatment W4N0 had the lowest IWUE and WUE.Alfalfa nitrogen use efficiency (ANUE) showed different patterns with different nitrogen fertilizer and irrigation rates.In the W1, W2 and W3treatments, ANUE was greatest in the N2 treatment and reduced at higher or lower N application rates, while in the W4 treatment, ANUE was decreased with increased nitrogen application rate.Nitrogen partial factor productivity (PFPN) was decreased significantly with the increase of nitrogen application rate.ANUE was decreased by irrigation at lower water application rates but was increased by irrigation at higher application rates, while PFPN showed the opposite pattern with highest PFPN at intermediate irrigation rates, indicating that irrigation at an appropriate rate can improve the ANUE and PFPN of alfalfa.From these results, to optimize hay yield while conserving water and fertilizer resources, W3N2 (620mm, 120kg·ha-1) was indicated as the best irrigation and fertilizer treatment combination for alfalfa under drip irrigation in this region.The study provides valuable information for improving management of alfalfa in the Yellow River irrigation region of Ningxia.关键词
紫花苜蓿/水氮供应/生产性能/水氮利用效率Key words
alfalfa/water and nitrogen supply/production performance/water and nitrogen use efficiency引用本文复制引用
胡伟,张亚红,李鹏,王小菊,张鹏,何毅,康馨匀..水氮供应对地下滴灌紫花苜蓿生产性能及水氮利用效率的影响[J].草业学报,2019,28(2):41-50,10.基金项目
宁夏回族自治区对外科技合作项目资助项目 （）
宁夏高等学校一流学科建设(草学学科)资助项目(NXYLXK2017A01)资助 （草学学科）
