| Influence of fertilizer application on transform characteristics of soil urea under single film hole infiltration |
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| DOI：10.7606/j.issn.1000-7601.2012.01.02 |
| Key Words: film hole irrigation point source infiltration fertilizer application urea transform characteristics |
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| Abstract: |
| Based on lab experiment, the influence of fertilization application on transform characteristics of soil urea under film hole single point infiltration was researched. The results show that the transform laws of urea under different fertilization modes are the same. The NH+4-N content comes to the maximum value in 5 days after fertilization and decreases to the background value rapidly in the succedent 10 days. While the NO-3-N content increases all along and comes to the maximum value in 15 days after fertilization. The distribution characteristics NH+4-N and NO-3-N after transform of soil urea are different. The soil NH+4-N content and NO-3-N content
under irrigation with fertilizer decrease with the distance further from the film hole center. The distribution of soil NH+4-N content and NO-3-N content under surface application concentrate in the 7～15 cm scope below soil surface. The distribution of soil NH+4-N content and NO-3-N content under deep application concentrate in the 5～17 cm scope below soil surface. The result
s lay a foundation for study of film hole irrigation fertilizer technique. |