In Marin County in northern California, a team formed with the Marin Carbon Project including the Carbon Cycle Institute, the Marin Resource Conservation District, UC Cooperative Extension, and UC Berkeley, worked together to demonstrate the potential of an application of compost to open rangelands. They showed that a single application of compost significantly increased plant production and soil carbon sequestration over three years. And, the addition of compost led to increased water-holding capacity in the soils.
For specifics and a summary of the team, results, implications, and resources, go to the Marin Carbon Project site at Can Land Management Enhance Soil Carbon sequestration?
See also, The Ecological Society of America Journal publication - Effects of organic matter amendments on net primary productivity and greenhouse gas emissions in annual grasslands
by Rebecca Ryals, Whendee L. Silver