干旱区生态环境知识资源中心(Arid): Impact of Deficit Irrigation on Shallow Saline Groundwater Contribution and Sunflower Productivity in the Imperial Valley, California

Arid

DOI	10.3390/w12020571
	Impact of Deficit Irrigation on Shallow Saline Groundwater Contribution and Sunflower Productivity in the Imperial Valley, California
	Eltarabily, Mohamed Galal 1,2; Burke, John M.3; Bali, Khaled M.2
通讯作者	Eltarabily, Mohamed Galal
来源期刊	WATER
EISSN	2073-4441
出版年	2020
卷号	12 期号:2
英文摘要	Yield and production functions of sunflower (Helianthus annuus) were evaluated under full and deficit irrigation practices with the presence of shallow saline groundwater in a semi-arid region in the Imperial Valley of southern California, USA. A growing degree day (GDD) model was utilized to estimate the various growth stages and schedule irrigation events throughout the growing season. The crop was germinated and established using overhead irrigation prior to the use of a subsurface drip irrigation (SDI) system for the remainder of the growing season. Four irrigation treatments were implemented: full irrigation (100% full sunflower crop evapotranspiration, ETC), two reduced irrigation scenarios (95% ETC and 80% ETC), and a deficit irrigation scenario (65% ETC). The salinity of the irrigation water (EC) (Colorado River water) was nearly constant at 1.13 dS.m(-1) during the growing season. The depth to groundwater and groundwater salinity (ECGW) were continuously monitored in five 3 m deep observation wells. Depth to groundwater fluctuated slightly under the full and reduced irrigation treatments, but drastically increased under deficit irrigation, particularly toward the end of the growing season. Estimates of ECGW ranged from 7.34 to 12.62 dS.m(-1). The distribution of soil electrical conductivity (ECS) and soil matric potential were monitored within the active root zone (120 cm) at selected locations in each of the four treatments. By the end of the experiment, soil salinity (ECS) across soil depths ranged from 1.80 to 6.18 dS.m(-1). The estimated groundwater contribution to crop evapotranspiration was 9.03 cm or approximately 16.3% of the ETC of the fully irrigated crop. The relative yields were 91.8%, 82.4%, and 83.5% for the reduced (95% and 80% ETC) and deficit (65% ETC) treatments, respectively, while the production function using applied irrigation water (IW) was: yield = 0.0188 x (IW)(2) - 15.504 x IW + 4856.8. Yield reduction in response to water stress was attributed to a significant reduction in both seed weight and the number of seed produced resulting in overall average yields of 2048.9, 1879.9, 1688.1, and 1710.3 kg.ha(-1) for the full, both reduced, and deficit treatments, respectively. The yield response factor, k(y), was 0.63 with R-2 = 0.745 and the irrigation water use efficiencies (IWUE) were 3.70, 3.57, 3.81, and 4.75 kg.ha(-1).mm(-1) for the full, reduced, and deficit treatments, respectively. Our results indicate that sunflowers can sustain the implemented 35% deficit irrigation with root water uptake from shallow groundwater in arid regions with a less than 20% reduction in yield.
英文关键词	Helianthus annuus groundwater contribution soil salinity water use efficiency yield components Imperial Valley
类型	Article
语种	英语
国家	Egypt ; USA
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000519846500262
WOS关键词	FIELD-GROWN SUNFLOWER ; HELIANTHUS-ANNUUS L. ; LEAF EXPANSION ; USE EFFICIENCY ; SOIL-SALINITY ; WATER ; EVAPOTRANSPIRATION ; RESPONSES ; NITROGEN ; YIELD
WOS类目	Environmental Sciences ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315730
作者单位	1.Port Said Univ, Fac Engn, Civil Engn Dept, Port Said 42523, Egypt; 2.Univ Calif Parlier, UC Kearney Agr Res & Extens Ctr, Parlier, CA 93648 USA; 3.Univ Georgia, Dept Plant Biol, Miller Plant Sci, Athens, GA 30602 USA
推荐引用方式 GB/T 7714	Eltarabily, Mohamed Galal,Burke, John M.,Bali, Khaled M.. Impact of Deficit Irrigation on Shallow Saline Groundwater Contribution and Sunflower Productivity in the Imperial Valley, California[J],2020,12(2).
APA	Eltarabily, Mohamed Galal,Burke, John M.,&Bali, Khaled M..(2020).Impact of Deficit Irrigation on Shallow Saline Groundwater Contribution and Sunflower Productivity in the Imperial Valley, California.WATER,12(2).
MLA	Eltarabily, Mohamed Galal,et al."Impact of Deficit Irrigation on Shallow Saline Groundwater Contribution and Sunflower Productivity in the Imperial Valley, California".WATER 12.2(2020).