Nitrification Inhibitor Effects on Nitrous Oxide Emission,Nitrogen Transformation,and Maize (Zea mays L.) Yield in Loamy Sand Soil in Thailand |
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| Authors: | P Pengthamkeerati A Modtad |
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| Institution: | 1. Department of Environmental Technology and Management, Faculty of Environment, Kasetsart University, Bangkok, Thailand;2. Environmental Technology Research Unit (EnviTech), Kasetsart University, Bangkok, Thailand;3. Environmental Technology Research Unit (EnviTech), Kasetsart University, Bangkok, Thailand |
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| Abstract: | The nitrification inhibitors (NIs) effects on soil nitrogen (N) fates and maize yields were investigated in a loamy-sand soil in Thailand. The treatments were chemical fertilizer (CF) and CF with dicyandiamide (DCD) or neem oil at two rates of 5% and 10%. Compared to the CF plot, DCD and neem oil reduced the cumulative nitrous oxide (N2O) emission by the equivalent of 26% and 10%, respectively (P < 0.05). DCD and neem oil had a positive effect in slowing ammonium (NH4+)-conversion and prolonging NH4+-N in the soil with a maximum efficiency of 45% and 30%, respectively. NO3–N was higher in the NI plots (P < 0.05), but the effect was less pronounced later in the growing season. Adding the NIs increased maize yields and N uptake, but was only significant (P < 0.10) for neem oil. Results indicate that applying NIs is an effective method to mitigate soil N losses and enhancing N use efficiency in a tropical, agricultural field. |
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| Keywords: | Maize nitrification inhibitor soil inorganic N soil N2O emission tropics |
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