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渗灌是将灌溉水送入透水管道内,水借土壤毛细管吸力作用使水直接进入作物根区附近,以供作物吸收利用的一种灌水方法。灌溉水在土壤中的运动状况对于了解渗灌条件下非饱和土壤水的运动规律、浸润范围、渗水速度以及确定管道埋深、管距等有着密切的关系。 试验是在一个安装了玻璃的土壤箱中进行的。土壤箱高1.6米;长1.5米,宽1.0米,土壤箱上面按不同距离和深度安装有15～25根负压计,用于明察土壤吸力变化情况。土壤箱内表土以下40—52.5厘米处理设内径为12.5厘米的塑料管,用四种不同透水孔径塑料管,即为别在四根塑料管的管顶以下三分之一的管表面积下钻有直径为0.9、0.7、0.3、0.1厘米的园孔四排,纵向间距为10厘米,成梅花状交错布置,以便控制渗管单位渗水率q
Infiltration irrigation is the irrigation water into the permeable pipe, water by the soil capillary suction to make water directly into the crop near the root zone for crop absorption and utilization of a method of irrigation. The movement of irrigation water in the soil is very important for understanding the movement law, infiltration rate, water seepage velocity, depth of buried pipe and pipe pitch under unsaturated soil water infiltration. The test was carried out in a glass-lined soil box. Soil height of 1.6 meters; 1.5 meters long, 1.0 meters wide, above the soil box at different distances and depths installed 15 ~ 25 negative pressure gauge, used to understand changes in soil suction. 40-52.5 cm below the surface soil in the soil box Set a plastic pipe with an inner diameter of 12.5 cm and use four kinds of plastic pipes with different water permeable apertures to drill the pipe surface area of the pipe below the pipe top of the four plastic pipes Diameter of 0.9,0.7,0.3,0.1 cm garden hole four rows, the longitudinal spacing of 10 cm, arranged in a plum-like staggered arrangement in order to control seepage unit permeability q