RICE is one of the largest single sources of methane within crop agriculture. During a recent media tour around the International Rice Research Institute (IRRI) in Los Baños, practical farm technologies supported by advanced measurement systems and upgraded laboratory infrastructure are increasing the understanding of greenhouse gases from rice production in major rice-growing countries.
Leading the program is Ando Radanielson, a senior scientist at IRRI and lead of the climate change mitigation and environmental sustainability research presented the institute’s Rice Emissions Measurement and Mitigation Technology (Remet), a framework designed to connect on-the-ground farming practices with verified emissions data and national policy requirements.
Remet integrates three layers: field measurement, modeling and reporting. At the field level, emissions are captured using closed chamber systems and sensor-assisted monitoring that measure methane and nitrous oxide under real farming conditions. These datasets are processed through models that scale results across farms and regions, producing estimates that can be used at national level. The final layer feeds into greenhouse gas inventories and climate reporting systems, enabling governments to include rice agriculture in their Nationally Determined Contributions (NDCs) under global climate agreements.
A key development supporting Remet is IRRI’s strengthened laboratory capability.
Its latest gas chromatography laboratory features new equipment that enables researchers to examine methane and nitrous oxide samples collected from field trials.
Using chamber-based sampling methods, gases are captured directly from rice paddies and then analyzed under controlled laboratory conditions to produce reliable, standardized measurements. These outputs underpin the Remet framework by validating emissions reductions from practices such as alternate wetting and drying.
The significance of the laboratory lies in its impact on data quality and comparability. IRRI can now generate consistent, high-resolution datasets across varied geographies and production systems, addressing a persistent challenge in agricultural emissions research. Accurate measurement has long constrained the wider adoption of low-emission practices, and the enhanced laboratory is intended to remove that bottleneck.
Measuring emissions in real time, using advanced analyzers that improve detection sensitivity and enable continuous monitoring under different farming conditions. Complementing these are modeling and data platforms where results are processed, scaled and aligned with national reporting requirements.
Together, these create a full pipeline, from field collection to laboratory validation to large-scale modeling addressing what Radanielson mentioned as a “a long-standing gap in agricultural emissions measurement.”
Radanielson stressed that credible measurement is essential for scaling solutions. Without it, even widely adopted practices cannot be formally recognized in climate policy or linked to financing mechanisms such as carbon markets. With Remet, rice farming practices can be quantified, verified and translated into measurable mitigation outcomes.
Field demonstrations showed how these systems are directly linked to practical technologies. Alternate Wetting and Drying (AWD) remains a cornerstone. By allowing fields to dry to a set threshold before re-irrigation, farmers reduce water use by up to 30 percent while maintaining yields. The process also improves soil aeration and significantly reduces methane emissions, turning a traditional liability into a mitigation opportunity.
The IRRI senior scientist also noted that the strength of AWD lies in its accessibility. It requires minimal additional investment, is easy to adopt and delivers multiple gains simultaneously, including lower input costs and improved crop resilience. Its simplicity makes it scalable across smallholder systems, particularly in countries like the Philippines.
Other technologies complement this approach. Direct-seeded rice reduces labor requirements and early water demand by eliminating transplanting, while mechanization, land leveling and improved weed management ensure consistent yields. Aerobic rice systems are being tested for environments wherein water scarcity limits traditional flooded cultivation.
Digital agriculture is increasingly integrated into these systems. Remote sensing, satellite data, drone monitoring and decision-support tools allow farmers to adjust irrigation and inputs based on real-time conditions, improving efficiency and reducing risk under variable climates.
All these elements converge within Remet’s broader objective: transforming practical farm techniques into measurable climate solutions. By linking field practices with laboratory validation and national reporting frameworks, IRRI is enabling governments to embed rice agriculture into climate strategies and explore results-based financing and carbon credit mechanisms.
IRRI’s practical solutions to methane monitoring in rice farming is no longer judged solely by yield, but by how efficiently that yield is produced. Through the integration of practical technologies, advanced laboratories and robust measurement systems, IRRI is positioning rice systems as both highly productive and climate-responsive at scale.