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| Dynamic variation and runoff loss evaluation of nitrogen in the surface water of paddy fields as affected by single basal fertilizer application |
| Received:February 07, 2018 |
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| KeyWord:single basal fertilizer application;slow-release fertilizer;nitrogen;surface runoff |
| Author Name | Affiliation | E-mail | | WANG Qiang | Institute of Environmental Resources and Soil Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | JIANG Li-na | Institute of Environmental Resources and Soil Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | jln@mail.hz.zj.cn | | PAN Jian-qing | Changxing Agricultural Bureau, Zhejiang Province, Changxing 313100, China | | | MA Jun-wei | Institute of Environmental Resources and Soil Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | YE Jing | Institute of Environmental Resources and Soil Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | ZOU Ping | Institute of Environmental Resources and Soil Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | |
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| Abstract: |
| To evaluate the risk of nitrogen runoff loss from single fertilization in monocropping systems, field experiments were conducted to determine the effects of the types of slow-release N fertilizer(SRN), the ratios of SRN to urea, and the application amount of N fertilizer on the N concentrations in rice paddy surface water. The results showed that the concentrations of ammonium nitrogen(NH4+-N) in rice paddy surface water after single application of different SRNs(180 kg N·hm-2), compared to multiple applications of urea(225 kg N·hm-2), were ranked as follows:nitrification inhibitor urea > conventional multiple application of urea > resin-coated urea > polymer-coated urea. At a rate of 180 kg·hm-2 for nitrogen fertilizer, the NH4+-N concentration in rice paddy surface water decreased as SRN usage increased. However, no significant difference was seen in NH4+-N in the surface water at rates between 180 kg·hm-2 and 144 kg·hm-2. All nitrogen runoff amounts peaked on the fifth day for both single and multiple urea fertilizations. With the combination of SRN and reduced nitrogen fertilizer application, single fertilization did not increase the risk in nitrogen runoff loss, although it required more basal fertilizer than that with multiple fertilizations. |
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