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| Simulation experiments on soil water movement in multiple point sources drip irrigation |
| ZHANG Lin, WU Pu-Te, ZHU De-Lan, FAN Xing-Ke |
(Institute of Water Saving Agriculture in Arid Regions of China, Northwest A ＆ F University, Yangling, Shaanxi 712100, China) |
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Abstract In order to provide a guide to reasonable design of drip irrigation system for closegrown crops, soil water movement in drip irrigation of multiple point sources was simulated by indoor physical experiment.The spatialtemporal dynamic distribution of soil water was mainly studied under different emitter discharge rates.There were three stages in the infiltration, namely, point source infiltration, overlapped wetting front and wetting belt.The characters of soil water distribution were complex in the upper zone and relatively simple in the lower zone in the wetted volume.In the upper zone of wetted volume, there was a region with higher soil water content under the emitter and a zone with lower water content near the surface between two emitters.The soil water content tended to be uniform on the same layer in the lower zone of wetted volume.After the end of irrigation,difference in water content on the same layer in the wetted soil was decreased due to soil water redistribution.Compared to a higher emitter discharge, the infiltration depth was deeper and the average soil water content was lower at a smaller discharge at the end of irrigation for the same irrigation amount.After the irrigation was completed, the difference in infiltration depth was slight for different emitter discharges due to soil water redistribution.
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Received: 29 September 2011
Published: 30 March 2012
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