Updated Mar 30, 2019

Masaharu Murakami

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“Prolonged MD” (1-week longer than the local practice) can reduce 30% of net global warming potential (GWP)of methane (CH4) plus nitrous oxide (N2O) generated from paddy fields without reducing the yield and quality of rice.

Extending the drying time can reduce the amount of CH4 generated, since removing the water and sending oxygen to the soil has the effect of suppressing the activity of anaerobic methanogens. However, there are many uncertain points, such as how long the period of MD extension is effective in reducing CH4 emission, how the extension of the MD period adversely affects on the yield and quality of ...
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Extending the drying time can reduce the amount of CH4 generated, since removing the water and sending oxygen to the soil has the effect of suppressing the activity of anaerobic methanogens. However, there are many uncertain points, such as how long the period of MD extension is effective in reducing CH4 emission, how the extension of the MD period adversely affects on the yield and quality of rice grain and how much it will increase N2O emission, the spread of extending the drying time to agricultural sites has not progressed. Therefore, we carried out a nationwide scale field test that set the MD period from 0 (always flooded) to 4 weeks and revealed that “Prolonged MD” (1-week longer than the local MD practice) reduced about 30% of net 100-year GWPs (CH4 + N2O) generated from paddy fields without reducing the yield and quality of rice. Thus, “Prolonged MD” is a simple and inexpensive method to reduce greenhouse gas from rice paddy fields.
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Stage 5: Scaling

"Prolonged MD" has been approved by the Japanese government as a subsidy program to reduce greenhouse gas emissions from agriculture and has been applied to over 20,000 hectares of paddy fields in Japan. It is also beginning to be applied in India.
Registered in Japanin Japan

Focus Areas:

Agriculture, Environment and Water Management

Agriculture, Environment and Water ManagementSEE LESS

Implemented In:

Japan and India

Japan and IndiaSEE LESS

2
Countries Implemented In
20,000
Customers
5
Employees
$1,600,000
Funds Raised to Date

Problem

The Global Warming Potential (GWP) is a measure of how much energy the emissions of 1 ton of a gas will absorb over 100 years, relative to the emissions of 1 ton of carbon dioxide (CO2). Methane (CH4) and nitrous oxide (N2O) are greenhouse gases that have the GWP of 28-36 and 265-298. Especially in paddy soil, CH4 accounts for 27% of whole anthropogenic CH4 emission in the world, and its reduction is expected to contribute to the prevention of global warming in the agricultural sector.

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Solution

“Prolonged MD” (1-week longer than the local MD practice) can suppress 30% of net GWP of CH4 plus N2O without reducing the yield and quality of rice. This water management technology by “Prolonged MD” is an economically effective measure against global warming, as the additional farming costs are extremely small.

Target Beneficiaries

Paddy rice farmers in Southeast Asia, South Asia, Latin America, China and Africa

Mission and Vision

Our team will seek a solution to mitigate greenhouse gas from agriculture sector while adapting climate change and meeting increasing demand of agricultural products.

Competitive Advantage

The development of effective mitigation strategies aimed at minimizing the global warming potential of rice cropping systems must consider the emissions of both CH4 and N2O gases. Additional application of organic matters to paddy soils may increase soil organic carbons which can make carbon sequestration and CO2 reduction from atmosphere. But surplus application of organic materials to paddy soil cause enhancement of CH4 and N2O emission as these materials are substrate of these gases. Some chemicals or specially designed fertilizer may decrease CH4 or N2O gases by suppressing microbial activities. But those materials request additional costs simply for reduction of GHGs. It is not necessary for farmers to pay additional cost to reduce GHGs without any other benefit as enhancement of rice production. "Prolonged MD" solves these problems by controlling irrigation period tuning at a very low cost without reducing the yield and quality of rice.

Planned Goals and Milestones

The adoption of effective irrigation strategies in the paddy rice system is one of the most promising options for mitigating GHG emissions. In addition to our “Prolonged MD” water management, alternate wetting and drying irrigation strategies originally developed by International Rice Research Institute is another effective reduction method of GHG emissions from paddy soil. Best mix of these water managements should be required for global GHG mitigation and sustainable rice production.
Funding Goal380,000
Projected Cumulative Lives Impacted700
New Implemented CountriesBrazil, Argentina, Kenya, Uruguay, Uganda, Tanzania
Recruit3 management, 2 board, 1 advisor and 6 volunteer
New FeatureBiochar made by rice husks and straws could contribute to carbon sequestration in addition to CH4 reduction by prolonged MD water management

The Team Behind the Innovation

Our team including already retired members continuously tackled with harmonizing GHG reduction and increasing rice production in global scale mainly monsoon Asian countries. From early 1990s, we settled measurement equipment to several developing Asian countries funded by multi stakeholders and collaborated with local farmers. Both bottom-up and top down approaches were harmonized in our activities including national government, local communities, academics in our "Prolonged MD" project.

EXECUTIVE TEAM INCLUDES WOMEN

Milestone

Mar 2019
Recognition ReceivedPENDING
Apr 2017
New Country Implemented In
India
Apr 2008
New Country Implemented In
Japan

Supporting Materials

Mitigation-of-methane-emissions-from-paddy-fields-by-prolonging-mid-season-drainage-MARCO-Symposium-2012.pdf