The nitrous oxide (N2O) emission potential of 21 acidic tea field soils in Japan was evaluated using a laboratory incubation method. The range of pH values of the soils was 6.26–2.96, and 17 of the 21 soils were strongly acidified below pH 5.0 due to long-term heavy application of nitrogen fertilizer. The N20 emission potential ranged from 0.001 to 1.463 µg N2O-N g-1 d-1. There was a negative exponential relationship between the soil pH value and N2O emission potential. The application of more than 1,000 kg N ha-1 y-1 of nitrogen fertilizer significantly enhanced the N2O emission potential of acidic tea field soils.
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Tokuda et al. (2001) studied this question.
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