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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Soil Science

Background:

  • Land-use conversion in subtropical China, from woodlands to tea fields, elevates nitrous oxide (N2O) emissions.
  • Increased nitrogen fertilizer application in tea cultivation is a primary driver of these emissions.
  • High N2O fluxes in fertilized tea fields necessitate urgent mitigation strategies.

Purpose of the Study:

  • To investigate methods for reducing N2O emissions from tea fields.
  • To evaluate the efficacy of a novel biofertilizer in mitigating N2O emissions and enhancing tea yield.
  • To explore sustainable agricultural practices for subtropical tea plantations.

Main Methods:

  • Field investigation of N2O fluxes using static closed chamber-gas chromatography.
  • Liquid-state and solid-state fermentation of agricultural waste (sweet potato starch wastewater and paddy straw) with Trichoderma viride to produce biofertilizer.
  • Comparative analysis of N2O emissions and tea yield between synthetic nitrogen fertilizer and biofertilizer application.

Main Results:

  • N2O fluxes in tea fields with synthetic N fertilizer were 9.4 times higher than in woodlands.
  • Biofertilizer application at 225 kg N ha(-1) yr(-1) significantly reduced N2O emissions by 33.3%-71.8%.
  • Biofertilizer application increased tea yield by 16.2%-62.2% compared to synthetic N fertilizer.

Conclusions:

  • Bioconversion and bioaugmentation using agricultural waste offer a cost-effective and feasible method for reducing N2O emissions in tea fields.
  • The developed biofertilizer represents a best management practice for sustainable tea cultivation.
  • This approach mitigates greenhouse gas emissions while improving crop productivity.