| Effect of different irrigation amount on NO-3-N leaching in the soil of cotton field in Alaer irrigated area |
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| DOI：10.7606/j.issn.1000-7601.2009.03.28 |
| Key Words: NO-3-N leaching loss irrigation cotton field Alaer irrigated area |
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| Abstract: |
| Taking the Alar irrigated area as experiment site, we designed four irrigation treatments: 8 100, 6 600, 5 100 and 3 600 m3/hm2, and measured the content variation of NO-3-N in 0～100 cm soil and the leaching solution concentration variation of NO-3-N in 105 cm soil after 5 times of irrigation.The results showed that irrigation obviously affected NO-3-N loss.During the growing period from April to September, as time went by, NO-3-N concentration tended to go down in the upper layer of the edaphic section but increase gradually in the deeper layer;in deep soil, NO-3-N concentration tended to get higher when the amount of irrigation water was increased.The changing of NO-3-N concentration in the leakage loss was as the following: Basically the variation tendencies of NO-3-N concentrations were low-high-low and large varied amplitude;The amount of NO-3-N loss was logarithmicly related to the amount of irrigation water, and the amount of NO-3-N loss was 2.18～21.23 kg·hm-2. |
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