Lime-nitrogen application reduces N_2O emission from a vegetable field with imperfectly-drained sandy clay-loam soil(Environment)
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概要
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We studied the effect of lime-nitrogen (calcium cyanamide, CaCN_2) application on the emission of nitrous oxide (N_2O) from a vegetable field with imperfectly-drained sandy clay-loam soil. Lime-nitrogen acts as both a pesticide and a fertilizer. During the decomposition of lime-nitrogen in the soil, dicyandiamide (DCD), a nitrification inhibitor, is formed, and as a result lime-nitrogen application may mitigate N_2O emission from the soil. The study design consisted of three different nitrogen-application treatments in field plots with a randomized block design. The nitrogen application treatments were: CF (chemical fertilizer), LN (all nitrogen fertilizer applied as lime-nitrogen), and CFD (chemical fertilizer containing DCD). Soil nitrification activity was lower in the LN and CFD plots than in the CF plots, and nitrification was inhibited for a longer period in the LN plots than in the CFD plots. In the LN plots, N_2O emission was lower than those of other treatments from 20 to 40 days after fertilization, a period when large peaks of N_2O emission were observed after rainfall in the CF and CFD plots. Cumulative N_2O emission over 63 days in the CF plots (mean ± standard deviation: 30.2 ± 14.4 mg N_2O m^<-2>) and CFD plots (24.3 ± 10.8 mg N_2O m^<-2>) was significantly higher than that in the LN plots (10.7 ± 1.2 mg N_2O m^<-2>; P < 0.05). Our results suggested that lime-nitrogen application decreased N_2O emission by inhibiting both nitrification and denitrification.
- 一般社団法人日本土壌肥料学会の論文
著者
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YAGI Kazuyuki
National Institute for Agro-environmental Sciences
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AKIYAMA Hiroko
National Institute for Agro-Environmental Sciences
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Yagi Kazuyuki
National Inst. For Agro‐environmental Sci. Ibaraki Jpn
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YAMAMOTO Akinori
National Institute for Agro-Environmental Sciences
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NAOKAWA Takuji
Denki Kagaku Kogyo Kabushiki Kaisha
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