Nitrification Inhibitor,Fertilizer Rate,and Temperature Effects on Nitrous Oxide Emission and Nitrogen Transformation in Loamy Sand Soil |
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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: | An incubation study investigated the effects of nitrification inhibitors (NIs), dicyandiamide (DCD), and neem oil on the nitrification process in loamy sand soil under different temperatures and fertilizer rates. Results showed that NIs decreased soil nitrification by slowing the conversion of soil ammonium (NH4+)-nitrogen (N) and maintaining soil NH4+-N and nitrate (NO3?)-N throughout the incubation time. DCD and neem oil decreased soil nitrous oxide (N2O) emission by up to 30.9 and 18.8%, respectively. The effectiveness of DCD on reducing cumulative soil N2O emission and retaining soil NH4+-N was inconsistently greater than that of neem oil, but the NI rate was less obvious than temperature. Fertilizer rate had a stronger positive effect on soil nitrification than temperature, indicating that adding N into low-fertility soil had a greater influence on soil nitrification. DCD and neem oil would be a potential tool for slowing N fertilizer loss in a low-fertility soil under warm to hot climatic conditions. |
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| Keywords: | Dicyandiamide fertilizer rate neem oil soil inorganic N soil N2O emission temperature |
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