Agricultural Practices and Carbon Sequestration

The document argues that integrated organic farming systems, which combine crop rotation with low chemical inputs, are more effective at sequestering soil carbon than conventional chemical-intensive systems. It specifically challenges the long-held belief that no-till practices are superior for carbon sequestration, citing recent research indicating that no-till may only increase carbon at shallow depths while plowed soils often sequester more carbon at greater depths.

• Integrated soil-based systems that combine crop rotation with low or no use of industrial fertilizers, herbicides, and pesticides are highly promising for carbon sequestration. Long-term research, including work by the Rodale Institute, indicates these systems build significant soil organic carbon through mechanisms like the increased abundance of mycorrhizal fungi.
• Organic farming systems sequester more carbon than conventional chemical-intensive systems. In direct comparisons, organic plowed systems sequestered more carbon than conventional no-till systems, even when sampling was limited to shallow soil where no-till typically shows accumulation.
• Recent scientific evidence suggests that no-till practices do not sequester more carbon than conventional plowing when the entire soil profile is measured. While no-till may show higher carbon levels in the top few centimeters due to crop residues, plowed soils typically sequester more carbon at greater depths.
• Specific studies support the finding that no-till offers no sequestration advantage over plowing: a review of 51 studies examining depths greater than 30 cm found no significant difference in 35 of them; an on-farm assessment in three eastern US states showed no statistical difference across most sites; and a three-year study in Quebec, Canada, found that higher carbon in plowed fields at lower depths compensated for lower surface carbon in no-till fields.

APA

Union of Concerned Scientists (2009). Agricultural Practices and Carbon Sequestration. https://www.ucs.org/sites/default/files/2019-09/ag-carbon-sequest-fact-sheet.pdf

Chicago

Union of Concerned Scientists. Agricultural Practices and Carbon Sequestration. 2009. https://www.ucs.org/sites/default/files/2019-09/ag-carbon-sequest-fact-sheet.pdf.

Wikipedia

{{cite report |author=Union of Concerned Scientists |title=Agricultural Practices and Carbon Sequestration |date=1 October 2009 |url=https://www.ucs.org/sites/default/files/2019-09/ag-carbon-sequest-fact-sheet.pdf |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{unionofconcernedscientists2009agricultural, author = {{Union of Concerned Scientists}}, title = {{Agricultural Practices and Carbon Sequestration}}, institution = {Union of Concerned Scientists}, year = {2009}, month = oct, url = {https://www.ucs.org/sites/default/files/2019-09/ag-carbon-sequest-fact-sheet.pdf}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }