| Influence of fertilizer solution concentration on NO-3-N transport characteristics under single-line interference film hole infiltration |
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| DOI：10.7606/j.issn.1000-7601.2008.04.08 |
| Key Words: film hole irrigation single-line interference infiltration fertilizer solution concentration NO-3—N concentration distribution |
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| Abstract: |
| Based on lab experiment NO-3—N concentration distribution characteristics under single-line interference film hole infiltration with different fertilizer solution concentration were studied．The concentration front transport distance of NO-3—N under single-line interference film hole infiltration had the same pattern as the movement of soil wetting front．The concentration front transport distance of NO-3—N and the maximum value of NO-3—N concentration in soil profile increased with the increase of the solution concentration in the same time．The NO-3—N concentration increased with the increase of the solution concentration at the same depth．The subsection function model for NO-3—N concentration distribution characteristics and wetting body depth of film hole center and interference interface center under fertilizer solution infiltration was developed and the model was verified by measured data．The concentration front transport distance of NO-3—N and the maximum value of NO-3—N concentration increased with the increase of the time in the process of water supply．The concentration front transport distance of NO-3—N increased with the increase of the time in the process of redistribution but the maximum value of NO-3—N concentration decreased． |