| Experimental study on soil nitrogen distribution characteristics under film hole irrigation |
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| DOI：10.7606/j.issn.1000-7601.2010.01.04 |
| Key Words: border irrigation film hole irrigation moisture content NO-3-N NH+4-N |
| Author Name | Affiliation | | CAO Jun | Institute of Water Resources, Xi'an University of Technology, Xi'an, Shaanxi 710048, China | | FEI Liangjun | Institute of Water Resources, Xi'an University of Technology, Xi'an, Shaanxi 710048, China | | TUO Yunfei | Institute of Water Resources, Xi'an University of Technology, Xi'an, Shaanxi 710048, China |
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| Abstract: |
| The soil nitrogen distribution characteristics under conventional border and film hole irrigation was analyzed through field experiment. The results shows that compared with border irrigation, the soil profile moisture of hole irrigation changes uniformly under the condition of same irrigation quota, and the soil moisture of film hole irrigation is 19.2% and 18.3% higher respectively than that of border irrigation after one day and five days of irrigation at the depth of 0～30 cm; The ammonium nitrogen is mainly distributed
in 0～30 cm soil layer, and its content is little influenced by soil water movement under the condition of same irrigation quota. The distribution over time of Ammonium nitrogen content in soil under hole irrigation is even more than that under border irrigation. With its maximum value of 41.6 mg/kg, the Ammonium nitrogen content of hole irrigation has increased by 4.3% compared with that of border irrigation; The nitrate nitrogen content has largely affected by irrigation way under the condition of same irrigation quota, the nitrate nitrogen content in 0～50 cm soil layer under the film hole irrigation has increased by 41.3%, 96.3%, 55.3%, 50.7% and 46.5% respectively than that of border irrigation. The nitrate nitrogen content of the film hole irrigation distributed uniform over the soil depth and time, and mainly in 0～50 cm soil layer, which benefits to the absorption of nitrogen for crops and improvement of nitrogen utilization. |
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