In order to investigate the characteristics of water and nitrogen migration under multi-point source infiltration in the muddy water-filled membrane hole irrigation

the indoor hydrophobic membrane hole infiltration device was used to test the influence of the infiltration solution (0 g/L

1 g/L

2 g/L

3 g/L

and 4 g/L ammonium nitrate solution) on the infiltration laws

the occurrence time of one-way intersections and multi-directional intersections

the water content in the vertical direction of film hole centers and junctions (the plant intersection center

the inter-row intersection

and the 4-point source intersection)

and the distribution law of NO3--N. The results showed that the cumulative infiltration and permeation time per unit area of membrane pores showed a power function relationship

the infiltration index a decreased with the increase of fertilizer concentration while the infiltration index b increased with the increase of fertilizer concentration. With the increase of fertilizer concentration

the occurrence time of one-way intersection and multi-directional intersection was advanced. At the depth of 10 cm soil

the water content of each center increased by 10.42%

13.94%

16.38%

and 24.74%

respectively

compared with 0 g/L treatment. The water content in each center varied with the increment of soil depth. NO3--N was evenly distributed in the upper layer of the soil

and showed peak at the wet front. The NO3--N content at the 4-poing source intersection center was higher than the other 3centers.The results provide a basis for improving the theory of water-filled membrane hole irrigation.