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| Simulating Migration and Leaching of Water and Nitrogen in Maize Soil Profile in North China Plain with RZWQM Model |
| Received:June 15, 2014 |
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| KeyWord:RZWQM model;maize;nitrogen leaching;North China Plain;fertilizer |
| Author Name | Affiliation | E-mail | | XUE Chang-liang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
Northeast Agricultural University, Harbin 150030, China | | | ZHANG Ke-qiang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHANG Guo-yin | Institute of Agro-Resourse and Environment, Hebei Academy of Agricultural and Forestry Sciences, Shijiazhuang 050051, China | | | YANG De-guang | Northeast Agricultural University, Harbin 150030, China | deguangyang@sina.com | | SONG Shuai | Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China | | | WANG Feng | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | wangfeng_530@163.com |
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| Abstract: |
| This study simulated the relationship between soil nitrogen leaching and crop yield in North China Plain using Root Zone Water Quality Model(RZWQM), and the feasibility of model to optimize fertilization was also explored. A rotation trial of winter wheat-summer maize was conducted on Dahe experiment station in Shijiazhuang, Hebei. Four nitrogen treatments were used, including 575 kg·hm-2(N3), 400 kg·hm-2(N2), 215 kg·hm-2(N1), and 0 kg·hm-2(N0). Water contents and nitrogen concentrations in different layers of soil profile from the N3 treatment were used for model calibration, and the data obtained from three other treatments were used for model validation. The calibration and validation results showed the Root Mean Square Error(RMSE) of water contents in soil profile were 0.003 6 cm3·cm-3 and 0.010 6 cm3·cm-3, and nitrate RMSEs of N3, N2, N1 and N0 treatments were 6.56 mg·kg-1, 7.30 mg·kg-1, 3.64 mg·kg-1 and 1.53 mg·kg-1, respectively. We further predicted the dynamics of nitrate leaching and ammonia volatilization during summer maize using the model parameters. The results revealed that the amount of nitrate leaching and ammonia volatilization reduced significantly as the quantity of nitrogen fertilizer was decreased during the cultivation, and that this model is an efficient tool to predict nitrate leaching in soil profile during crop cultivation in North China Plain even though there was slight deviation in prediction. |
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