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Open AccessArticle

Optimization of Spring Wheat Irrigation Schedule in Shallow Groundwater Area of Jiefangzha Region in Hetao Irrigation District

by Zhigong Peng 1,2, Baozhong Zhang 1,2,*, Jiabing Cai 1,2, Zheng Wei 1,2,*, He Chen 1,2 and Yu Liu 1,2
1
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
2
National Center of Efficient Irrigation Engineering and Technology Research-Beijing, Beijing 100048, China
*
Authors to whom correspondence should be addressed.
Water 2019, 11(12), 2627; https://doi.org/10.3390/w11122627
Received: 28 September 2019 / Revised: 9 December 2019 / Accepted: 10 December 2019 / Published: 13 December 2019
(This article belongs to the Special Issue Study of the Soil Water Movement in Irrigated Agriculture)
Due to the large spatial variation of groundwater depth, it is very difficult to determine suitable irrigation schedules for crops in shallow groundwater area. A zoning optimization method of irrigation schedule is proposed here, which can solve the problem of the connection between suitable irrigation schedules and different groundwater depths in shallow groundwater areas. The main results include: (1) Taking the annual mean groundwater depth 2.5 m as the dividing line, the shallow groundwater areas were categorized into two irrigation schedule zones. (2) On the principle of maximizing the yield, the optimized irrigation schedule for spring wheat in each zone was obtained. When the groundwater depth was greater than 2.5 m, two rounds of irrigation were chosen at the tillering–shooting stage and the shooting–heading stage with the irrigation quota at 300 mm. When the groundwater depth was less than 2.5 m, two rounds of irrigation were chosen at the tillering–shooting stage, and one round at the shooting–heading stage, with the irrigation quota at 240 mm. The main water-saving effect of the optimized irrigation schedule is that the yield, the soil water use rate, and the water use productivity increased, while the irrigation amount and the ineffective seepage decreased. View Full-Text
Keywords: crop model; water consumption; yield; water production function; irrigation schedule optimization crop model; water consumption; yield; water production function; irrigation schedule optimization
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Peng, Z.; Zhang, B.; Cai, J.; Wei, Z.; Chen, H.; Liu, Y. Optimization of Spring Wheat Irrigation Schedule in Shallow Groundwater Area of Jiefangzha Region in Hetao Irrigation District. Water 2019, 11, 2627.

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