Compared with the soil moisture, the ammonium nitrogen content in the soil was much slower than that of the soil moisture. The ammonium nitrogen concentration in the soil mainly accumulated near the center of the membrane pores. The soil nitrate transport velocity was the same as the soil moisture transport velocity. Foreign research on membrane pore fluid infiltration has been relatively few, but mostly concentrated on drip irrigation and sprinkler irrigation. In short, the study of membrane pore irrigation mostly focused on water migration and its influencing factors, while the study on the effects of membrane hole irrigation on soil water distribution characteristics and nitrogen transport and transformation was less. This study lays a scientific foundation for improving the efficiency of nitrogen irrigation in membrane irrigation. Soil bulk density tester is an important instrument for measuring soil bulk density. In the research work has a very important role.
According to the symmetry of the point source infiltration wetting body, the membrane hole device uses square water chamber with 1/4 membrane hole area, placed at the corner of the earth box, the membrane hole diameter is 6.0cm, and the test water supply system adopts scaled horizontal A transparent plexiglass Maroon bottle with a cross-sectional area of ​​30.5 cm2 is automatically supplied. There are 3 sets of test devices and 3 repetitions of tests.
The membrane hole infiltration process is divided into three stages: the first stage is the free infiltration process where the horizontal wetting fronts of the adjacent membrane holes infiltrate do not intersect, and the second stage is the intersection of the membrane holes in the direction of the crop row. One-way intersection infiltration did not occur between the adjacent membrane pores; the third stage was the multi-directional infiltration stage where crop rows and adjacent membrane pores intersected. This paper mainly studies the free infiltration of fertilizers in membrane pores. It has the characteristics of strong point water diffusion, and does not consider the interaction of water infiltration and nutrients between different membrane pores. The wetted body is an ellipsoid. The average soil water content, its average nitrate-nitrogen and ammonium-nitrogen averages are the vertical profiles within 5.0 cm of the center of the membrane pores in the wetted body and the water cuts and nitrate-nitrogen in the 2.5 cm × 2.5 cm × 2.5 cm soil masses. The average value of ammonium nitrogen.
The determination of soil bulk density tester found that, at the same distribution time, the larger the soil bulk density, the lower the average soil moisture content and its change and change rate. The soil bulk density is the same, and the average soil moisture content and its rate of change decrease with the extension of the transformation time, and its variation gradually increases.
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