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| Effect of rewater on transport of water and nitrogen under water storage pits irrigation |
| Yin Yanzhe, Ma Juanjuan, Sun Xihuan, Guo Xianghong |
| College of Water Resource Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China |
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Abstract In order to clarify the effect of rewatering after irrigation(rainfall)on transport of water and nitrogen, as well choose a reasonable way of irrigation methods, by means of indoor model test, the impact of the different rewatering volume(140.1,228.7,400.5 mm)and different rewatering interval(1,5,10 d after irrigation)on the migration of water and nitrogen was studied. The results show that the soil moisture content increases after rewatering. When the rewater volume is up to 1.73 L,the range of 30-80 cm depth soil moisture rate can reach more than 80% of the field capacity. The more rewatered or the shorter the interval time of rewatering was, the more uniform the moisture content distribute can be obtained. Nitrate has features of migrating with the soil water movement easily and accumulating at the wetting front. The nitrate nitrogen′s concentration of the soil near the pit wall reduces after rewatering, and the peak of nitrate nitrogen′s concentration is to the far forward. The more rewatering or the shorter the interval time of rewatering is,the farther nitrate nitrogen can be transported. The ammonium nitrogen of the soil near the pit wall decreases slightly, while the ammonium nitrogen of the soil far from the pit has a slight increasing. The more rewatering or the shorter the interval time of rewatering is, the larger the effect on ammonium nitrogen concentration can be obtained and the more uniform distribution of the ammonium nitrogen can be observed.
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Received: 30 November 2012
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