In this paper, we built soil moisture transform model, the crop root water absorption model and the solute transport model with using HYDRUS-1D software, and then, simulated the transportation and transformation of the nitrogen in unsaturated zone at Guanzhong basin in Shaanxi province. The results indicate: 1)The rule of crop root adsorbing water and nitrogen is consistent, and the main absorption of ammonia nitrogen, the absorption rate is 35%; 2)the nitrate nitrogen and nitrate are more likely to be leac...
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