| The experiment was conducted to investigate the influence of dripping end flow and irrigation volume on the distribution pattern of NH+4N in soil,and to analyze the change rules of NH+4N concentration in horizontal and vertical directions.The results showed that the biggest wetting distances in both horizontal and vertical directions were expanded along with the increase of dripping end flow and irrigation volume,and the surface seeper radius was also expanded along with the increase of dripping end flow.An increase of dripping end flow in certain scale could change the distribution pattern of NH+4N in wet soil,and influence the NH+4N concentration in the spread boundary and the biggest spread distance.As the volume of irrigation and fertilization was increased,the spread distance of NH+4N was enlarged and the NH+4N concentration in the spread zone was enhanced. |