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N sub(2)O emissions from banana plantations in tropical China as affected by the application rates of urea and a urease/nitrification inhibitor
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N sub(2)O emissions from banana plantations in tropical China as affected by the application rates of urea and a urease/nitrification inhibitor
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N sub(2)O emissions from banana plantations in tropical China as affected by the application rates of urea and a urease/nitrification inhibitor
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Journal Article
N sub(2)O emissions from banana plantations in tropical China as affected by the application rates of urea and a urease/nitrification inhibitor
2015
Overview
In this study, we quantified N sub(2)O fluxes from banana plantations in China using a field experiment as well as static chamber and gas chromatography techniques. We utilized five levels of urea treatments, including CK (no urea addition); urea addition at a rate of 312 (U1), 415 (U2), 519 (U3), and 623 kg N ha super(-1) (U4); and a combination of urea (U3) and urease (NBPT) and nitrification (DCD) inhibitor (U3 + I) treatments. Soil temperature, moisture, and the concentrations of NH sub(4) super(+) and NO sub(3) super(-) have been monitored throughout the study. Compared to CK (11.8 mu g m super(-2) h super(-1) and 14.2 t ha super(-1), respectively), urea addition significantly increased N sub(2)O emission fluxes and banana yields (88.2-177 mu g m super(-2) h super(-1) and 19.4-25.0 t ha super(-1), respectively). The stimulation effect of urea on N sub(2)O emissions was significantly higher than its effect on banana yield. N sub(2)O emission occurred in pulses during banana cultivation due to repeated topdressing. The cumulative N sub(2)O emissions and N sub(2)O emission factor of urea applied in banana plantations were estimated to be 6.39-12.8 kg N ha super(-1) and 1.46-2.31 %, respectively. Notably, N sub(2)O emissions were significantly positively correlated with urea application rate, temperature, and NH sub(4) super(+) levels, suggesting that temperature and NH sub(4) super(+) availability are the most important factors controlling N sub(2)O emissions in tropical banana plantations. Combined NBPT and DCD treatment greatly reduced N sub(2)O emissions (by 65.4 %) and increased banana yields (by 4.5 %).
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