Nitrous oxide (N2 0) production from acid (pH 3.60) tea field soil under aerobic conditions was studied in a laboratory experiment. A large amount of N 20 (53 pg N g-I soil 14 d-I) was produced under aerobic conditions when ammonium and nitrate were added to the soil. It was assumed that the high N 20 produc- tion was an inherent property of the soil because soil pre-treatments (e.g., air-drying) did not affect it. A I5N tracer study indicated that N 2 was not produced from the acid tea field soil. N 20 was produced during biological reactions, and the contribution of N2 0 production during chemical reactions to the whole N20 production was negligible. Nitrapyrin (2-chloro-6-(trichloro- 0 production. These results indicate that denitrifi- methyl)-pyridine) and acetylene (0.1 Pa), which are selective nitrification in- hibitors, slightly reduced N2 cation is the main process of N20 production in acid tea field soil. The levels of N 20 production from four tea field soils collected from the same area were compared. The results showed that a large amount of N 20 is likely to be produced from a soil with a pH value below about 3.60 and to which a large amount of nitrogen fertilizer (more than 1,000 kg N ha-I y-I) had been added.
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