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| Effects of inhibitors on denitrification and ammonia volatilization in submerged soils |
| A Limu·A Bulaiti1, SHE Dong-li1, ZHANG Wen-juan1, XIA Yong-qiu2 |
1. College of Agricultural Engineering, Hohai University, Nanjing 210098, China;
2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China |
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Abstract Three nitrification inhibitors treatments,2.5% (DCD1), 5.0%(DCD2) and 7.5%(DCD3) of nitrogen fertilizer application, and three urease inhibitors treatments, 0.1% (HQ1), 0.3%(HQ2), 0.5%(HQ3) of nitrogen fertilizer application, and three combined nitrification and urease inhibitors treatments, 2.5%+0.1% (HH1), 5.0%+0.3%(HH2), 7.5%+0.5% (HH3), were experimented in this study to investigate the influence of inhibitors on denitrification and ammonia volatilization losses in laboratory experiment. The quantitative influence relationship among inhibitors, nitrogen losses (denitrification and ammonia volatilization) and environmental factors were further explored using path analysis method. The results showed that application of dicyandiamide alone could significantly inhibit denitrification loss, but increase NH3 volatilization. Application of hydroquinone alone could effectively inhibit NH3 volatilization, but had ineffective effects on denitrification loss. Combined application of dicyandiamide and hydroquinone significantly inhibited both denitrification loss and ammonia volatilization, especially at HH2 (5.0% dicyandiamide +0.3% hydroquinone. Compared to CK, HH2 decreased the denitrification and ammonia volatilization losses by 31.3% and 12.5%, respectively. Path analysis showed that dicyandiamide and hydroquinone mainly decreased the sediment NO3--N, sediment NH+ 4-N, overlying water NH+ 4-N and overlying water DON concentration, and thus decreased denitrification and ammonia volatilization rate.
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Received: 10 May 2019
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