Long-Term Biochar Application Enhances Carbon-Phosphorus Costabilization and Mitigates Methane Emissions in Flooded Rice Systems.
Chen H, Xu J, Yuan J, Wang L, Chen G
Soil Health
Rice feeds half the world, and finding a way to grow it while reducing planet-warming methane gas and keeping nutrients in the soil could make the food on your plate less damaging to the climate.
Scientists spread charred rice straw (called biochar) on rice paddies every year for 13 years and found it helped the soil hold onto phosphorus — a key plant nutrient that often gets washed away — while also reducing the methane gas that flooded rice fields naturally produce. The longer biochar was used, the better these benefits became, suggesting it's a 'gets better with age' solution. This is exciting because rice farming is one of the biggest agricultural sources of methane, a greenhouse gas far more potent than CO2.
Key Findings
Biochar applications of up to 22.5 tonnes per hectare over 13 years progressively enhanced carbon-phosphorus stabilization in flooded rice soils
Long-term biochar use measurably reduced methane emissions from flooded rice paddies, addressing a major agricultural greenhouse gas source
The benefits of biochar compounded over time, indicating that sustained multi-year application is key to realizing climate and nutrient-retention gains
chevron_right Technical Summary
A 13-year field trial shows that adding biochar made from rice straw to flooded rice paddies significantly improves the soil's ability to hold onto phosphorus while also cutting methane emissions — two major challenges in sustainable rice farming.
Abstract Preview
Biochar is increasingly promoted as a climate-smart amendment, yet its long-term effects on nutrient retention and greenhouse gas emissions in flooded rice systems remain poorly resolved. Here, we ...
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