Abstract
Soil acidification is a major problem for sustainable agriculture since it limits productivity of several crops. Liming is usually adopted to ameliorate soil acidity that can trigger soil processes such as nitrification, denitrification, and loss of nitrogen (N) as nitrous oxide (N2O) emissions. The loss of N following liming of acidic soils can be controlled by nitrification inhibitors (such as dicyandiamide). However, effects of nitrification inhibitors following liming of acidic soils are not well understood so far. Here, we conducted a laboratory study using an acidic soil to examine the effects of dolomite and dicyandiamide (DCD) application on N2O emissions. Three levels of DCD (0, 10, and 20 mg kg−1; DCD0, DCD10, and DCD20, respectively) were applied to the acidic soil under two levels of dolomite (0 and 1 g kg−1) which were further treated with two levels of N fertilizer (0 and 200 mg N kg−1). Results showed that N2O emissions were highest at low soil pH levels in fertilizer-treated soil without application of DCD and dolomite. Application of DCD and dolomite significantly (P ≤ 0.001) reduced N2O emissions through decreasing rates of NH4 +-N oxidation and increasing soil pH, respectively. Total N2O emissions were reduced by 44 and 13 % in DCD20 and dolomite alone treatments, respectively, while DCD20 + dolomite reduced N2O emissions by 54 % when compared with DCD0 treatment. The present study suggests that application of DCD and dolomite to acidic soils can mitigate N2O emissions.
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Acknowledgments
Authors are grateful to Dr. Rob Harris, Research Scientist (Hamilton, Victoria, Australia) for checking earlier version of this manuscript. Authors are also thankful to anonymous reviewers for providing constructive comments. This research work was financially supported by the National Natural Science Foundation of China (41171212) and the National Basic Research Program of China (2012CB417106).
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Shaaban, M., Wu, Y., Peng, Qa. et al. Effects of dicyandiamide and dolomite application on N2O emission from an acidic soil. Environ Sci Pollut Res 23, 6334–6342 (2016). https://doi.org/10.1007/s11356-015-5863-y
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DOI: https://doi.org/10.1007/s11356-015-5863-y