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Using chisel plow cuts carbon
dioxide loss in fall tillage
Using a chisel plow during fall tillage will maintain surface residue and minimize soil disturbance, which in turn will reduce carbon dioxide loss, according to Agricultural Research Service scientists in Auburn, Ala.
Plant physiologist Stephen A. Prior and agricultural engineer Randy L. Raper of the ARS National Soil Dynamics Laboratory at Auburn are studying Carbon dioxide loss and how it relates to the farm equipment used and the time of year tillage takes place. While some Carbon dioxide always escapes to the atmosphere, losing too much of it during tillage may hurt the environment and can reduce soil productivity.
The scientists looked at loamy sand soil in east-central Alabama to see how much Carbon dioxide escaped due to the plowing of a grain sorghum field. Discing caused more Carbon dioxide release than chisel plowing, because greater soil disturbance results from discing. Plots of land that were not tilled had low levels of Carbon dioxide loss, similar to those of fields that were chisel plowed.
Reduced Carbon dioxide loss was also found in plots where tillage was delayed until the spring. Leaving the crop residue in place over the winter months and postponing tillage until spring slows residue decomposition and protects the soil during winter rains.
More information about this research can be found in the March 2004 issue of Agricultural Research magazine on the World Wide Web at www.ars.usda.gov/is/AR/archive/mar04/carbon0304.htm.
Date: 3/9/04
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