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Rice Management Systems

1.0

The American Carbon Registry (ACR) approved methodology Voluntary Emission Reductions in Rice Management Systems is applicable to Agricultural Land Management (ALM) project activities that involve a change in rice cultivation practices. The methodology was developed by Terra Global Capital LLC with support from Applied Geosolutions LLC, the Environmental Defense Fund and the California Rice Commission.

Parent Methodology

The methodology is modular in structure, lending itself to applicability in rice-growing regions around the world. The parent methodology provides definitions, applicability criteria, project boundary definition, baseline and additionality requirements, quantification methods, monitoring and verification requirements, and uncertainty calculations for all modules. The methodology defines Rice-Growing Regions, geographic regions in which the climate and rice management practices are relatively homogeneous, and over which the DNDC model (the main quantification tool in this methodology) is calibrated and validated.

California Regional Calibration Module

Approved simultaneously with the parent methodology is a regional calibration module for California. Eligible activities in California include (1) removal of rice straw from the field after harvest, (2) replacing water seeding with dry seeding, and (3) early drainage at the end of the growing season. Project Proponents who implement practices that increase Nitrogen use efficiency concurrently with these practices can combine this methodology with an ACR methodology for nitrous oxide emissions from fertilizer management in order to receive credits from reducing nitrous oxide emissions in addition to methane and/or carbon dioxide.

Mid-South Regional Calibration Module

The regional calibration module for the Mid-South applies to two U.S. rice-growing regions: 1) the Mississippi River Delta in Arkansas, Mississippi and Missouri, and 2) the Gulf Coast area in Louisiana. The Gulf Coast area in Texas may be added at a later date.

Eligible activities under the Mid-South module include: 1) removal of rice straw from the field after harvest, 2) early drainage at the end of the growing season, 3) intermittent flooding during the growing season, and 4) increased water and/or energy use efficiency, achieved through measures including but not limited to: convert contour levees to precision or zero grade; use of side inlet/poly piping systems; use of more efficient diesel pumps; switch from diesel to electric pumps; use of soil moisture sensors to tailor flood to water needs. Project Proponents who implement practices that increase Nitrogen use efficiency concurrently with these practices can combine this methodology with an ACR methodology for nitrous oxide emissions from fertilizer management in order to receive credits from reducing nitrous oxide emissions in addition to methane and/or carbon dioxide.

Structural Uncertainty Deduction Factors

Projects must apply an uncertainty deduction factor to account for model structural uncertainty and ensure conservative crediting. The structural uncertainty represents the uncertainty inherent in the DNDC model and is set using independent validation data (directly measured daily methane fluxes on benchmark sites) available at the time of methodology publication. Additional data will become available in the future, allowing the structural uncertainty deduction factors to be updated. In addition, as more fields are registered, structural uncertainty should decline, so the structural uncertainty deduction depends on the number of fields in all projects registered on ACR. Project proponents must always use the most recent version of structural uncertainty deduction factors.

DNDC Model

Baseline and project emissions are quantified using the Denitrification – Decomposition (DNDC) model. Please download the version of DNDC included below, which has been specifically calibrated for rice projects. Other versions (e.g. from the UNH website) are not to be used.

Current approved versions

          • DNDC Model Zip File: Save this in a root directory such as C:\. Then using a file compression program such as WinZip, right-click on the DNDC.zip file and choose “Extract to here.” This will create a folder C:\DNDC, with several subfolders as well as the DNDC95.exe file. Double-click this .exe file to launch DNDC. You will also see a User Guide file called GuideDNDC95.pdf; see page 10 of this guide for installation instructions.

             

            Process Documentation

            • California public comments: none
            • Parent Methodology and California Module scientific peer review comments and responses rounds 1,2,3,4 and rounds 5,6,7
            • Mid-South public comments: none
            14. Agriculture, Forestry, Land Use
            Contents
            File PDF documentCalifornia Module v1.0 Errata Corrected
            File PDF documentErrata and Clarification v1.0 Feb2014 FINAL
            File PDF documentMidsouth Module ACR v1.0 Feb2014 FINAL
            File PDF documentMidsouth Rice Module Peer Review Report FINAL
            File PDF documentRice Methodology ACR v1.0 July 2013 FINAL
            File PDF documentStructural Uncertainty Deduction Factors v2.0 Feb2014 FINAL
            File PDF documentVoluntary Emission Reductions in Rice Management Systems - Parent and CA PEER REVIEW REPORT ROUNDS 1 2 3 4
            File PDF documentVoluntary Emission Reductions in Rice Management Systems - Parent and CA PEER REVIEW REPORT ROUNDS 5 6 7
            File PDF documentVoluntary Emission Reductions in Rice Management Systems PUBLIC COMMENT DRAFT
            File Zip archiveRice DNDC_10/2014
            File PDF documentErrata and Clarifications May 2015
            File PDF documentSummary of Proposed Amendment
            File Zip archiveACR DNDC files: Rice CH4 June2016
            File Zip archiveDNDC ACR Rice CH4 08Jul2016
            File Zip archiveACR DNDC files: Rice CH4 Aug 2016
            File PDF documentACR Rice 1.0 E+C July 2016
            File PDF documentACR Rice 1.0 E+C Sept 2016
            File PDF documentRice 1.0 Structural Unc. Addendum Sept. 2016
            File PDF documentACR Rice 1.0 E+C Nov 2016
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