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Assessment of Methane and Nitrous Oxide Fluxes from Paddy Field by Means of Static Closed Chambers Maintaining Plants Within Headspace
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Water management--a tool for methane mitigation from irrigated paddy fields.

Larisha Tyagi1, Babita Kumari, S N Singh

  • 1Environmental Science Division, National Botanical Research Institute, Rana Pratap Marg, Lucknow, UP, India. larishatyagi@gmail.com

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PubMed
Summary

Water drainage significantly reduces methane (CH4) emissions from rice fields. Mid-season and multiple drainage strategies were most effective in mitigating CH4 efflux, offering a sustainable agricultural practice.

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Soil Science

Background:

  • Methane (CH4) efflux from paddy fields is a significant environmental concern.
  • Water management practices, particularly drainage, are crucial for mitigating CH4 emissions.

Purpose of the Study:

  • To compare four different drainage systems for their effectiveness in reducing CH4 efflux from rice fields.
  • To identify optimal drainage strategies for methane emission attenuation.

Main Methods:

  • Four drainage systems were evaluated: continuous flooding, tillering stage drainage, mid-season drainage, and multiple drainage.
  • Methane efflux was measured in mg/m(2)/day for each treatment.
  • Soil redox potential was monitored in relation to methane efflux.

Main Results:

  • Continuous flooding resulted in the highest methane efflux (346.6 mg/m(2)/day).
  • Tillering stage drainage showed a 9% reduction, mid-season drainage a 36.7% reduction, and multiple drainage a 41% reduction in CH4 efflux compared to continuous flooding.
  • A significant inverse relationship was observed between soil redox potential and methane efflux across all treatments.

Conclusions:

  • Mid-season drainage and multiple drainage are highly effective in mitigating methane efflux from rice cultivation.
  • Implementing strategic drainage practices can substantially reduce greenhouse gas emissions from agricultural lands.