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Soil water movement under infiltration of double point source drip irrigation |
Hou Lizhu1,2, Zhao Hang1 |
1. School of Water Resources and Environment, China University of Geosciences, 100083, Beijing, China; 2. Key Laboratory of Groundwater Circulation and Evolution (China University of Geosciences, Beijing), Ministry of Education, 100083, Beijing, China |
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Abstract Surface drip irrigation is the most advanced method of irrigation to date, which enables the application of appropriate amounts of water to the soil through drippers. Study of soil water movement under infiltration of point source drip irrigation plays an important role in the promotion of drip irrigation technology. An indoor soil bin was designed in this study. Time domain reflectometry (TDR100) probes and tensiometers were adopted to measure soil water contents and soil water potential, respectively. The infiltration rates and wetting front interference under double point source drip irrigation emitters were analyzed. With the distance apart from drip increasing, the soil moisture of wetted volume from drip irrigation was reduced, and the soil moisture of wetted front on the intersection side was not smaller than the soil moisture of similar wetted depth. The soil water content (SWC) of 5 -35 cm layer reached 0.315 cm3 / cm3 rapidly during the irrigation phase. The soil moisture of the top layer gradually decreased, the soil moisture of sublayers gradually increased, and the rate of change of soil moisture slowed down in the redistribution phase. Our study would help in designing surface drip systems for efficient water use with minimum drainage.
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Received: 28 October 2013
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