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| Experiment on water migration of surge root irrigation in loess sloping fields |
| Wang Youke1,2 , Li Penghong1,3 , Ma Lihui1,2 , Zhao Yingna1, Li Pengjun4 |
| (1.College of Water Resources and Architectural Engineering, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China; 2.Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China; 3.Chongqing Institute of Geology and Mineral Resources, Chongqing 400042, China; 4.China National Petroleum Offshore Engineering Co.Ltd., Tianjin 300451, China) |
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Abstract In order to know the water migration of a new micro-irrigation technique of surge root irrigation,different water migrations of surge root irrigation were studied by cross sectional method under different hold diameters and depths in the wild loess sloping fields. The results show that under different hole diameters and depths, there are different influences on the horizontal diffusion radius, the upward infiltration distance and the downward infiltration depth of wetting front, and all of them have remarkable power rules with time; During 24 h after stopping surge root irrigation, the wetting front increased more than 47% relatively on horizontal and vertical diffusion, and the average moisture content of wetted volume decreased 30% relatively; After 24 h the wetting front diffused less and the moisture content decreased less. Therefore the design of surge root irrigation system can be established on the characteristic value of wetted volume on 24 h after stopping surge root irrigation, it will be proper when the hole depth is 30～40 cm and the hole diameter is of 6 cm. This research results can provide theory reference on application of the surge root irrigation technology.
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Received: 29 December 2009
Published: 30 September 2010
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