水氮互作对河西走廊紫花苜蓿品质的影响

doi:10.11686/cyxb2017491

草业学报 ›› 2018, Vol. 27 ›› Issue (10): 76-83.DOI: 10.11686/cyxb2017491

水氮互作对河西走廊紫花苜蓿品质的影响

文雅, 张静, 冯萌, 郭正刚^*

兰州大学草地农业生态系统国家重点实验室,兰州大学草地农业科技学院,兰州大学草业科学国家级实验教学示范中心,兰州大学农业部草牧业创新重点实验室,甘肃兰州 730020

收稿日期:2017-11-22 修回日期:2018-02-01 出版日期:2018-10-20 发布日期:2018-10-20
通讯作者: E-mail: guozhg@lzu.edu.cn
作者简介:文雅(1997-),女,内蒙古鄂尔多斯人,在读本科。E-mail: weny16@lzu.edu.cn
基金资助:
教育部创新团队(IRT-17R50)和公益性行业(农业)科研专项经费 (201403048G3)资助

Effects of irrigation and nitrogen fertilizer on alfalfa quality

WEN Ya, ZHANG Jing, FENG Meng, GUO Zheng-gang^*

State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture and Science and Technology, National Demonstration Center for Experimental Grassland Science Education, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture, Lanzhou University, Lanzhou 730020, China

Received:2017-11-22 Revised:2018-02-01 Online:2018-10-20 Published:2018-10-20

摘要/Abstract

摘要： 通过研究不同灌溉量(W₁:117 mm;W₂:156 mm;W₃:192 mm)和施氮量(N₁:0 kg·hm^-2;N₂:40 kg·hm^-2;N₃:80 kg·hm^-2;N₄:120 kg·hm^-2)互作条件下河西走廊紫花苜蓿水分利用效率、品质和相对饲用价值的变化特征,旨在确定紫花苜蓿品质最优时的水氮配置模式。结果表明,水氮互作显著影响了紫花苜蓿水分利用效率、粗蛋白质含量、中性洗涤纤维含量和相对饲用价值(P<0.05),但对紫花苜蓿地上生物量、粗脂肪、粗灰分含量和酸性洗涤纤维含量影响不显著。紫花苜蓿水分利用效率、粗蛋白质含量、中性洗涤纤维含量和相对饲用价值随灌溉量和施氮量的增加均呈开口向下的抛物线,最大值出现的组合分别为W₂N₃和W₂N₂,说明只有水氮合理配置才能提高紫花苜蓿品质和相对饲用价值。

关键词: 水氮互作, 紫花苜蓿, 水分利用效率, 品质, 相对饲用价值

Abstract: The application of both nitrogen and irrigation have been shown to be beneficial to crop growth. A field experiment was carried out during 2015 in the Hexi Corridor to analyze the changeable characteristics of water use efficiency, quality and relatively feeding value of alfalfa under different irrigation regimes (W₁: 60% of conventional irrigation volumes; W₂: 80% of conventional irrigation; W₃: conventional irrigation) and nitrogen fertilizer levels (N₁: 0 kg·ha^-1; N₂: 40 kg·ha^-1; N₃: 80 kg·ha^-1; N₄: 120 kg·ha^-1). This study showed that the combination of different irrigation volumes and nitrogen fertilizer levels significantly affected the water use efficiency, crude protein content, neutral detergent fiber content and relatively feeding value of alfalfa but had no effect on aboveground biomass, crude fat content and crude ash content. Water use efficiency, crude protein content, neutral detergent fiber content and relatively feeding value of alfalfa all showed a downward trend (parabolic function) with increasing irrigation volumes and nitrogen fertilizer rate; the most beneficial combinations occurred in the W₂N₃, and W₂N₂ treatments which resulted in improved forage quality and relatively feeding value of alfalfa.

Key words: combination of irrigation volumes and nitrogen fertilizer levels, alfalfa, water use efficiency, quality, relatively feeding value

文雅, 张静, 冯萌, 郭正刚. 水氮互作对河西走廊紫花苜蓿品质的影响[J]. 草业学报, 2018, 27(10): 76-83.

WEN Ya, ZHANG Jing, FENG Meng, GUO Zheng-gang. Effects of irrigation and nitrogen fertilizer on alfalfa quality[J]. Acta Prataculturae Sinica, 2018, 27(10): 76-83.

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水氮互作对河西走廊紫花苜蓿品质的影响

Effects of irrigation and nitrogen fertilizer on alfalfa quality

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