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Land-use conversion from woodlands to tea fields in subtropical areas of central China leads to increased nitrous oxide (N 2 O) emissions, partly due to increased nitrogen fertilizer use. A field investigation of N 2 O using a static closed chamber-gas chromatography revealed that the average N 2 O fluxes in tea fields with 225 kg N ha −1  yr −1  fertilizer application were 9.4 ± 6.2 times higher than those of woodlands. Accordingly, it is urgent to develop practices for mitigating N 2 O emissions from tea fields. By liquid-state fermentation of sweet potato starch wastewater and solid-state fermentation of paddy straw with application of  Trichoderma viride , we provided the tea plantation with biofertilizer containing 2.4 t C ha −1  and 58.7 kg N ha −1 . Compared to use of synthetic N fertilizer, use of biofertilizer at 225 kg N ha −1  yr −1  significantly reduced N 2 O emissions by 33.3%–71.8% and increased the tea yield by 16.2%–62.2%. Therefore, the process of bioconversion/bioaugmentation tested in this study was found to be a cost-effective and feasible approach to reducing N 2 O emissions and can be considered the best management practice for tea fields.

Mitigating Nitrous Oxide Emissions from Tea Field Soil Using Bioaugmentation with aTrichoderma virideBiofertilizer