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| Nitrogen Loss and Use Efficiency in Greenhouse Vegetable Soil Under Different Water and Fertilizer Managements |
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| KeyWord:greenhouse vegetable; fertilizer application; irrigation method; nitrate leaching; nitrogen use efficiency |
| Author Name | Affiliation | | YIN Guan-yi | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | HU Ke-lin | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | LI Pin-fang | College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China | | LIU Rong-hao | Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: |
| Optimal applications of water and fertilizers are important for maintaining yield and reducing environmental pollution in greenhouse vegetable production. An experiment was conducted to examine nitrogen（N） loss pathways and nitrogen use efficiency（NUE） under different water and fertilizer managements in a tomato-growing greenhouse located in Shunyi, Beijing from August 2009 to January 2010. Six different water and fertilizer combinations were designed, including （i）traditional fertilization + traditional irrigation（N1F1）,（ii）optimal fertilization+optimal irrigation（N2F2）,（iii）reduced fertilizer + optimal irrigation（N3F2）,（iv）traditional fertilization+conventional drip irrigation（N1D1）,（v）the optimal fertilization + optimal drip irrigation（N2D2） and （vi）reduced fertilizer + optimal drip irrigation（N3D2）. We used the field observed dataset to calibrate and validate the EU-Rotate N model, and calculated N leaching, gaseous N loss and NUE. The results showed that the amounts of N leaching and gaseous N loss under different treatments accounted for 1%~9% and 5%~14% of total applied N, respectively. Nitrogen leaching for all treatments was in order：N1F1>N3F2≈ N2F2>N1D1>N2D2>N3D2. Compared with the corresponding furrow treatments, N leaching under drip treatments was reduced by 72%~87%, gaseous N loss decreased by about 40%, and the NUE increased by 32%~36%. Therefore, optimal fertilization and drip irrigation combination practices could significantly reduce N leaching and gaseous N loss and increase the NUE without decreasing tomato yields. |
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