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[1]HE Jing,BAI Dan,GUO Lin,et al.Study on Wetted Volume of Silt Loam Under Sub-irrigation with Vertical Tube Emitter[J].Research of Soil and Water Conservation,2016,23(06):69-72.

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Study on Wetted Volume of Silt Loam Under Sub-irrigation with Vertical Tube Emitter

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 23 Number of periods: 2016 06 Page number: 69-72 Column: Public date: 2016-12-28

Title:: Study on Wetted Volume of Silt Loam Under Sub-irrigation with Vertical Tube Emitter

Author(s):: HE Jing, BAI Dan, GUO Lin, WANG Xinduan; Institute of Water Resources and Hydroelectric Engineering, Xi’an University of Technology, Xi’an 710048, China

Keywords:: vertical tube emitter; wetted soil volume; sub-irrigation; soil moisture content; orthogonal experimental design

CLC:: S275.4

DOI:: -

Abstract:: Vertical tube emitter as a new sub-irrigation emitter which works under a low pressure head (0.6~2.0 m) for the root system growth zone, studying its infiltration characteristic is a necessary. The orthogonal experimental design was adopted to arrange the influence factors including pressure head, initial soil moisture content, diameter of vertical tube and soil bulk density to Table L₉(3⁴) of orthogonal experimental design (all the factors have 3 levels) and to study the characteristic parameters of wetted soil volume under sub-irrigation with vertical tube emitter, all the test followed the same study time (7 h). After the test, the radius of wetted soil volume had been measured by getting it out of the soil box and it was a whole because of the matrix potential. The radius of soil wetted volume was measured by manual inspection, the soil wetted volume was divided into 2 sections along axis Y. Then, the interval was marked as 2 cm for a test point to collect little wetted soil, oven drying method was used to measure the soil moisture content. The results pointed out that the order of radius was Y_{negative axis} ≥ X_axis ≥ Y_{positive axis}, and moisture content had an irregular distribution as like in horizontal plane as a circle, but in vertical plane as a ellipse, as well as that the variation of the average moisture content in soil wetted volume of vertical tube sub-irrigation greater than micro-moist irrigation can have a good satisfaction for water demand of different crops. This conclusion may have important directive significance for the further study on infiltration performance of a vertical tube emitter in subsurface irrigation and the application of a vertical tube emitter.

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