Influence of soil textures on transportation of water and nitrogen under single film hole infiltration of fertilizer solution

For searching the transport law of water and fertilizer under given conditions, based on lab experiment，the influences of soil textures on transport characteristics of water and distribution of NO-3 -N under single film hole infiltration of fertilizer solution were researched. The cumulative infiltration volume of soils with different textures followed the Kostiakov infiltration model. The relationships between transport distances of vertical and horizontal wetting fronts and infiltration time followed the power function equation. Soil texture had a significant influence on distribution and redistribution of soil water content. Distribution of the NO-3 -N contents of soils with different soil textures were relatively even and there were less difference on the NO-3 -N contents of soils at the 10 cm scope of upper wetting body with high water content at the end of water supply. The background value of NO-3 -N contents in soils with different textures had little influence on soil NO-3 -N distribution and redistribution at high water content section.