The experiments of fertilizer infiltration through muddy water film hole with four diameters (6

8

10 and 12 cm) were carried out in lab using Xi'an silty loam soil. Migration distance of the wetting front

cumulative infiltration

soil water distribution in the wetted body and transport characteristics of and were observed and analyzed. The results showed that:The film hole diameter had a significant effect on transport characteristics of water and nitrogen under the muddy water film hole irrigation. The cumulative infiltration amount of fertilizer through muddy water film hole with different diameters conformed to Philip infiltration model. There was a significant power function relationship between migration distance of the wetting front and infiltration duration. Within the same infiltration time

cumulative infiltration volume of per unit area gradually decreased with the increasing of film hole diameter

while migration distance of the wetting front and contents of NO-3-N and NH+4-N in the same position increased with the increasing of film hole diameter. Content NO-3-N and NH+4-N were both higher in the center of the film hole within 400 minutes of infiltration. The soil NO-3-N in the wetted body was mainly distributed in the range of 15 cm from the center of the film hole

and NH+4-N in the wetted body was mainly distributed in the range of 8 cm from the center of the film hole.