干旱区生态环境知识资源中心(Arid): Characterization of water use and productivity dynamics across four C-3 and C-4 row crops under optimal growth conditions

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DOI	10.1016/j.agwat.2019.105840
	Characterization of water use and productivity dynamics across four C-3 and C-4 row crops under optimal growth conditions
	Kukal, M. S.; Irmak, S.
通讯作者	Irmak, S.
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2020
卷号	227
英文摘要	Crop selection in irrigated conditions entails characterization of crop water use and productivity dynamics under limited freshwater availability in a changing climate and environment. There is ample scope to optimally irrigate row crops, given the associated economic returns under full irrigation, and relatively non-alarming groundwater declines to require limited irrigation, at least in many parts of the United States, including Nebraska. However, a fair and careful comparative assessment of cereal row crops for their efficiency of water use and associated metrics under optimal growth conditions is lacking. We conducted field research in semi-arid south central Nebraska during 2016-2018 to comprehensively characterize water use and productivity dynamics in four major C3 (soybean and winter wheat) and C4 [maize (long season or L.S. and shorter season or S.S.) and sorghum] crops under consistent and well-managed conditions. Crop-specific signatures were found in seasonal profiles of total soil-water and soil-water depletion. The highest seasonal total evapotranspiration (ETa) was demonstrated by winter wheat (604 mm), followed by L.S. maize (594 mm), soybean (591 mm), S.S. maize (547 mm), and sorghum (518 mm). Normalization and scaling of ETa was accomplished so as to better reflect comparative ETa per unit of heat accumulation (thermal units or TU). ETa was also studied relative to evaporative demand using single and basal crop coefficients (K-c and K-cb, respectively). Consequently, empirical functions were developed for K-c and K-cb, using base-scales of days after emergence, cumulative TU (CTU), and normalized CTU. Crop-specific sensitivity of K-cb to morphological area was studied. Crop water productivity based on grain yield (WPGY) and aboveground biomass (WPAGB) was quantified and it was found that the two C-4 crops were 89% more water-efficient than their C-3 counterparts. Finally, the importance of VPD to explain the variability and improve prediction of WPAGB in various crops was established.
英文关键词	C3 crops C4 crops Crop coefficients Evapotranspiration Crop water productivity Maize Sorghum Soybean Wheat
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000525275500008
WOS关键词	GRASS-REFERENCE EVAPOTRANSPIRATION ; LEAF-AREA INDEX ; SUBSURFACE DRIP IRRIGATION ; DAILY TEMPERATURE-RANGE ; GROWING DEGREE-DAYS ; LONG-TERM PATTERNS ; USE EFFICIENCY ; YIELD RESPONSE ; ALFALFA-REFERENCE ; AIR TEMPERATURES
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/2XILL650/313931
作者单位	Univ Nebraska, Lincoln, NE 68583 USA
推荐引用方式 GB/T 7714	Kukal, M. S.,Irmak, S.. Characterization of water use and productivity dynamics across four C-3 and C-4 row crops under optimal growth conditions[J],2020,227.
APA	Kukal, M. S.,&Irmak, S..(2020).Characterization of water use and productivity dynamics across four C-3 and C-4 row crops under optimal growth conditions.AGRICULTURAL WATER MANAGEMENT,227.
MLA	Kukal, M. S.,et al."Characterization of water use and productivity dynamics across four C-3 and C-4 row crops under optimal growth conditions".AGRICULTURAL WATER MANAGEMENT 227(2020).