干旱区生态环境知识资源中心(Arid): Nitrogen rate for cotton should be adjusted according to water availability in arid regions

Arid

DOI	10.1016/j.fcr.2022.108606
	Nitrogen rate for cotton should be adjusted according to water availability in arid regions
	Wu, Baojian; Zhang, Li; Tian, Jingshan; Zhang, Guojuan; Zhang, Wangfeng
通讯作者	Zhang, WF
来源期刊	FIELD CROPS RESEARCH
ISSN	0378-4290
EISSN	1872-6852
出版年	2022
卷号	285
英文摘要	Recent reports on cotton water use and root-canopy relationship responses to nitrogen (N) fertilizer management under varying water supply in arid regions are limited. This experiment was conducted to estimate cotton water use, root-canopy development, canopy photosynthetic rate (CAP), and yield responses to N application rates under varying water supply levels and to quantify associations between water use processes and N-induced variation in root systems. A two-year field experiment was conducted from 2019 to 2020 at a field site in Xin-jiang, China. Cotton root traits and agronomic responses to three N fertilizer application rates (320, 272, and 224 kg N ha(-1)) under two water supply levels (sufficient water supply: 400 mm; limited water supply: 267 mm) were evaluated. Root length density and root dry matter were maximized at 272 kg N ha(-1) under sufficient water supply and 320 kg N ha-1 under limited water supply. CAP was strongly associated with crop stage water use induced by root-canopy variation. Under sufficient water, 272 kg N ha(-1) substantially increased water use and root growth, slightly inhibited leaf expansion, and substantially improved crop yield compared to 320 and 224 kg N ha(-1). Although net root productivity and live root length declined for 320 kg N ha(-1) under limited water supply, yield increase was not limited because of higher CAP and water use induced by the establishment of strong shallow roots. The results demonstrate that moderate N rate (272 kg ha(-1)) under sufficient water supply improves yield through reducing LAI and promoting root growth, while higher N rate (320 kg ha(-1)) under limited water supply achieves high yield through higher CAP, sufficient leaf area, and efficient water uptake under shallow root systems. These findings suggest that both N management strategies and water availability levels should be considered in future efforts to scale from canopy to root level responses in cotton.
英文关键词	Root traits Root-canopy Photosynthetic capacity Water use efficiency
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000830519400001
WOS关键词	USE EFFICIENCY ; ROOT-GROWTH ; DISTRIBUTION PATTERNS ; DROUGHT RESISTANCE ; IRRIGATION WATER ; REDUCED NITROGEN ; DEFICIT STRESS ; YIELD ; WHEAT ; SOIL
WOS类目	Agronomy
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392582
推荐引用方式 GB/T 7714	Wu, Baojian,Zhang, Li,Tian, Jingshan,et al. Nitrogen rate for cotton should be adjusted according to water availability in arid regions[J],2022,285.
APA	Wu, Baojian,Zhang, Li,Tian, Jingshan,Zhang, Guojuan,&Zhang, Wangfeng.(2022).Nitrogen rate for cotton should be adjusted according to water availability in arid regions.FIELD CROPS RESEARCH,285.
MLA	Wu, Baojian,et al."Nitrogen rate for cotton should be adjusted according to water availability in arid regions".FIELD CROPS RESEARCH 285(2022).