| Characteristics of nitrate-N movement under film hole infiltration with fertilizer |
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| DOI：10.7606/j.issn.1000-7601.2007.02.14 |
| Key Words: nitrate nitrogen transport velocity transport concentration soil water content |
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| Abstract: |
| With solution for irrigation,the transport processes of nitrate nitrogen under film hole free irrigation with fertilizer was studied.The results showed that the transport velocity of nitrate nitrogen at the front in the wetting body in the horizontal direction and vertical direction was greatly influenced by soil water content and increased with soil water content increase;The transport velocity had a close correlation relationship with transport distance of nitrate nitrogen at the front and decreased with distance as power function.The concentration of nitrate nitrogen at the front increased with the distance,changed as exponential function,and reached to the maximum value at the surface of wet front(the interface of wet and dry soil);the concentration of nitrate nitrogen at the front decreased with soil water content increase as power function;the correlation coefficient between them reached very significant level. |
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