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Methodology : PH_AM004 Ver1.0

Methodology No.	PH_AM004
Proposed Methodology No.	PH_PM006
Sectoral scope	15. Agriculture
Title	Methane Emission Reduction by Water Management in Rice Paddy Fields
Summaries	GHG emission reduction measures : CH4 emission reductions achieved through change of water management scheme of rice paddy field, while increases/decreases of N2O and CO2 emissions are also considered. Uncertainty concerning both reference and project emissions are conservatively addressed through Uncertainty deduction (Ud) values. Calculation of reference emissions : Reference emissions are calculated based on CH4 and N2O emissions in reference fields in the same cultivation and environmental conditions including pre-season water regime, soil type, and type and amount of organic amendment of project rice paddy field. Direct measurement is used to estimate reference CH4 and N2O emissions. Country specific values for calculating CH4 emissions can also be used subject to cross-checking of the values obtained from direct measurement. N2O emissions can also be calculated from the amount of fertilizer applied. CO2 emissions from the use of irrigation and drainage pumps are optional for counting and calculated based on fuel consumption of the pumps. Calculation of project emissions : Project emissions are calculated based on CH4 and N2O emissions in project fields. Direct measurement is used to estimate project CH4 and N2O emissions. Country specific values for calculating CH4 emissions can also be used subject to cross-checking of the values obtained from direct measurement. N2O emissions can also be calculated from the amount of fertilizer applied. CO2 emissions from the use of drainage pumps for draining water from rice paddy fields are counted while those from the use of irrigation pumps are optional for counting. CO2 emissions are calculated based on fuel consumption of the pumps. Monitoring parameters : CH4 and N2O emission factors from rice paddy fields from both reference and project water regimes; Areas of project fields of each stratum and/or each filed; Total number of days under the project in a cropping season, when applicable; Application rate of organic amendment, when applicable; Application rate of nitrogen fertilizer, when applicable; Fuel consumption of drainage pumps for the project field (Fuel consumption of drainage pumps for the reference field and fuel consumption of irrigation pumps are optional).
Version Number	Ver1.0
Status	Valid
Methodology Proponent	Japan International Research Center for Agricultural Sciences on behalf of Expert Committee on Climate-Resilient Agriculture and Low-Carbon Food Systems in the ASEAN Region
Approved Methodology	JCM_PH_AM004_ver01.0.pdf JCM_PH_AM004_ver01.0.docx JCM_PH_AM004_ver01.0.xlsx
Proposed Methodology	JCM_PH_PM006_PM.pdf JCM_PH_PM006_PMS.xlsx JCM_PH_PM006_ADD1.pdf JCM_PH_PM006_ADD2.pdf JCM_PH_PM006_ADD3.pdf
Public inputs	21 Oct 24   -  04 Nov 24 Compilation of all inputs received.
Date of approval	03 Feb 25