United States Department of Agriculture
Natural Resources Conservation Service
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USDA Announces New Tool for Estimating Soil Carbon Sequestration 

Carbon sequestration in soils suggests that fluxes or movements of carbon from the atmosphere can be increased while the natural release of carbon back into the air can be reduced. By absorbing carbon instead of emitting it, soils could evolve from carbon sources to carbon sinks. This process relies on respiration and photosynthesis, two basic processes of the carbon cycle. Carbon, entering the soil in form of roots, litter, harvest residues, and animal manure, is stored primarily as soil organic matter (SOM). In undisturbed environments, balanced rates of input and decomposition determine steady state fluxes. However, in many parts of the world, agricultural and other land use activities have upset this natural balance, thereby releasing carbon to the atmosphere

Carbon sequestration in soils suggests that fluxes or movements of carbon from the atmosphere can be increased while the natural release of carbon back into the air can be reduced. By absorbing carbon instead of emitting it, soils could evolve from carbon sources to carbon sinks. This process relies on respiration and photosynthesis, two basic processes of the carbon cycle. Carbon, entering the soil in form of roots, litter, harvest residues, and animal manure, is stored primarily as soil organic matter (SOM).

NRCS is offering farmers and ranchers a new online management tool called COMET-VR that provides a simple and reliable method for estimating soil carbon sequestration. Storing, or “sequestering,” carbon in soil as organic matter and in trees helps reduce the amount of carbon dioxide in the atmosphere. COMET-VR was field tested by individuals involved in crop production, livestock grazing and conservation planning in Colorado, Georgia, Illinois, Ohio, Texas, and Wyoming.

NRCS news release “USDA Carbon Management Tool to Help Farmers and Ranchers with Soil Carbon Sequestration” (March 23, 2005)

usda logo news release “New Greenhouse Gas Reporting Guidance for Farms and Forests” (March 23, 2005)

COMET-VR

USDA Greenhouse Gas Reporting Guidelines

DOE Voluntary Reporting of Greenhouse Gases Program 1605(b)