| Effects of sprinkler irrigation on soil nitrate-N distribution and nitrogen uptake of winter wheat under the field conditions |
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| DOI：10.7606/j.issn.1000-7601.2007.06.28 |
| Key Words: sprinkler irrigation winter wheat soil NO-3-N plant nitrogen uptake |
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| Abstract: |
| The effects of sprinkler irrigation on soil nitrate-N distribution and nitrogen uptake of winter wheat were analyzed through two-year field experiments.The control treatment was traditional surface irrigation(border irrigation). The experimental results indicate that the peak of soil nitrate-N transports shallowly and distributes mainly within upper 40 cm soil layers where most roots of winter wheat distribute under sprinkler irrigation compared with under surface irrigation.In the sublayer of root zone of winter wheat,soil nitrate-N cumulates under surface irrigation in various degrees compared with under sprinkler irrigation.The accumulation of soil nitrate-N leached are 8.68 kg/hm2 and 7.70 kg/hm2 under surface irrigation in 2003 and 2004,respectively.The accumulation of soil nitrate-N leached under sprinkler irrigation is very small,about less than 3% of surface irrigation conditions.The amount of nitrogen uptake by winter wheat under sprinkler irrigation is 235.7 kg/hm2 and 161.7 kg/hm2 in two years,7.0 kg/hm2 and 34.7 kg/hm2 higher than that under surface irrigation,respectively.Sprinkler irrigation has the promoting effects on nitrogen uptake by winter wheat in the later period.The difference of nitrogen uptake by winter wheat during different growing periods between each year under sprinkler irrigation is all smaller than that under surface irrigation. |
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