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Journal of Integrative Agriculture  2020, Vol. 19 Issue (4): 1105-1116    DOI: 10.1016/S2095-3119(19)62750-4
Special Issue: Agro-ecosystem & Environment—Irrigation
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Canopy morphological changes and water use efficiency in winter wheat under different irrigation treatments
ZHAO Hong-xiang1, ZHANG Ping2, WANG Yuan-yuan2, NING Tang-yuan1, XU Cai-long3, WANG Pu 
1 College of Agronomy, Shandong Agricultural University, Tai’an 271018, P.R.China
2 College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, P.R.China
3 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
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Abstract  
Water is a key limiting factor in agriculture.  Water resource shortages have become a serious threat to global food security.  The development of water-saving irrigation techniques based on crop requirements is an important strategy to resolve water scarcity in arid and semi-arid regions.  In this study, field experiments with winter wheat were performed at Wuqiao Experiment Station, China Agricultural University in two growing seasons in 2013–2015 to help develop such techniques.  Three irrigation treatments were tested: no-irrigation (i.e., no water applied after sowing), limited-irrigation (i.e., 60 mm of water applied at jointing), and sufficient-irrigation (i.e., a total of 180 mm of water applied with 60 mm at turning green, jointing and anthesis stages, respectively).  Leaf area index (LAI), light transmittance (LT), leaf angle (LA), transpiration rate (Tr), specific leaf weight, water use efficiency (WUE), and grain yield of winter wheat were measured.  The highest WUE of wheat in the irrigated treatments was found under limited-irrigation and grain yield was only reduced by a small amount in this treatment compared to the sufficient irrigation treatment.  The LAI and LA of wheat plants was lower under limited irrigation than sufficient irrigation, but canopy LT was greater.  Moreover, the specific leaf weight of winter wheat was significantly lower under sufficient than limited irrigation conditions, while the leaf Tr was significantly higher.  Correlation analysis showed that the increased LAI was associated with an increase in the leaf Tr, but the specific leaf weight had the opposite relationship with transpiration.  Optimum WUE occurred over a reasonable range in leaf Tr.  In conclusion, reduced irrigation can optimize wheat canopies and regulate water consumption, with only small reductions in final yield, ultimately leading to higher wheat WUE and water saving in arid and semi-arid regions.
Keywords:  winter wheat        limited-irrigation        canopy characteristics        transpiration rate        water use efficiency  
Received: 30 January 2019   Accepted: 04 March 2020
Fund: This work was supported by the Special Fund for Agro-scientific Research in the Public Interest of China (201203031).
Corresponding Authors:  Correspondence XU Cai-long, Tel/Fax: +86-10-82108784, E-mail: xucailong@caas.cn; WANG Pu, Tel/Fax: +86-10-62733611, E-mail: wangpu@cau.edu.cn   
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Cite this article: 

ZHAO Hong-xiang, ZHANG Ping, WANG Yuan-yuan, NING Tang-yuan, XU Cai-long, WANG Pu. 2020.

Canopy morphological changes and water use efficiency in winter wheat under different irrigation treatments
. Journal of Integrative Agriculture, 19(4): 1105-1116.

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