干旱区生态环境知识资源中心(Arid): Effects of deficit irrigation on nitrogen uptake and soil mineral nitrogen in alfalfa grasslands of the inland arid area of China

Arid

DOI	10.1016/j.agwat.2022.107724
	Effects of deficit irrigation on nitrogen uptake and soil mineral nitrogen in alfalfa grasslands of the inland arid area of China
	Wu, Wanping; Liu, Minguo; Wu, Xiaojuan; Wang, Zikui; Yang, Huimin
通讯作者	Yang, HM
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2022
卷号	269
英文摘要	Soil nitrogen (N) availability is fundamental for N uptake and biomass accumulation by plants and is affected by irrigation management. Deficit irrigation is an efficient strategy to manage soil moisture for crop production. However, responses of N uptake and soil mineral N to deficit irrigation are not yet clear in alfalfa grasslands. A 2-year trial with alfalfa was carried out using two irrigation systems, flood and subsurface drip irrigations, at three irrigation levels: full irrigation, slight water deficit irrigation (70% of full irrigation), and moderate water deficit irrigation (50% of full irrigation) for the whole growth period. The N-uptake (N-uptake) and N use efficiency (NUE) of alfalfa, as well as the soil mineral N, were measured. The N-uptake by plant organs decreased with increasing deficit level of irrigation, but slight deficit irrigation barely reduced N-uptake as compared to full irrigation. Deficit irrigation led to a decrease in dry matter yield, especially in the 2nd year, but slight deficit irrigation reduced it little. In contrast, total N concentration in plant organs barely changed with the deficit level of irrigation, suggesting that biomass growth, rather than change in N concentration, may play a major role in regulating N-uptake. The NUE of alfalfa barely changed with the deficit level of irrigation, although there was a decreasing tendency in the 2nd year. There were significant correlations between N-uptake and NUE of alfalfa with soil ammonium N content, suggesting that this form of N is relatively short-lived and nitrate N may be adequate to meet the growth requirement of alfalfa. In practice, it is recommended that slight deficit irrigation should be set up during alfalfa production in the inland arid area of China.
英文关键词	Alfalfa Arid area Irrigation Nitrogen uptake Soil nitrogen availability
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000876567800003
WOS关键词	WATER-USE EFFICIENCY ; DRIP IRRIGATION ; LOESS PLATEAU ; GRAIN-YIELD ; GROWTH ; RATES ; FIELD ; RICE ; CROP ; FERTILIZATION
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/391623
推荐引用方式 GB/T 7714	Wu, Wanping,Liu, Minguo,Wu, Xiaojuan,et al. Effects of deficit irrigation on nitrogen uptake and soil mineral nitrogen in alfalfa grasslands of the inland arid area of China[J],2022,269.
APA	Wu, Wanping,Liu, Minguo,Wu, Xiaojuan,Wang, Zikui,&Yang, Huimin.(2022).Effects of deficit irrigation on nitrogen uptake and soil mineral nitrogen in alfalfa grasslands of the inland arid area of China.AGRICULTURAL WATER MANAGEMENT,269.
MLA	Wu, Wanping,et al."Effects of deficit irrigation on nitrogen uptake and soil mineral nitrogen in alfalfa grasslands of the inland arid area of China".AGRICULTURAL WATER MANAGEMENT 269(2022).