Land-use conversion from woodlands to tea fields in subtropical areas of central China leads to increased nitrous oxide (N2O) emissions, partly due to increased nitrogen fertilizer use. A field investigation of N 2O using a static closed chamber-gas chromatography revealed that the average N2O 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 N2O 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 2O 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 N2O emissions and can be considered the best management practice for tea fields. © 2014 Shengjun Xu et al.
Xu, S., Fu, X., Ma, S., Bai, Z., Xiao, R., Li, Y., & Zhuang, G. (2014). Mitigating nitrous oxide emissions from tea field soil using bioaugmentation with a trichoderma viride biofertilizer. The Scientific World Journal, 2014. https://doi.org/10.1155/2014/793752