Click on “Download PDF” for the PDF version or on the title for the HTML version.


If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

In-Row Subsoilers that Reduce Soil Compaction and Residue Disturbance

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Applied Engineering in Agriculture. 23(3): 253-258. (doi: 10.13031/2013.22677) @2007
Authors:   R. L. Raper
Keywords:   Draft force, Drawbar power, Cone index, Bulk density, Residue, Bentleg shanks, Subsoiler, soil compaction

Aboveground soil disruption prior to planting is avoided in conservation tillage systems due to the need to keep plant residue in place. However, belowground disruption is necessary in many Southeastern U.S. soils to ameliorate soil compaction problems. For use in conservation tillage systems, belowground soil disruption should be maximized while aboveground disruption should be minimized. To assist in choosing the best shank for strip-tillage systems which accomplish both objectives, comparisons were made between several shanks commonly used for conservation tillage systems to provide in-row subsoiling prior to planting. A tractor-mounted three-dimensional dynamometer was used to measure draft, vertical, and side forces in a Coastal Plain soil in Alabama. Three subsoiler systems were evaluated at different depths of operation: (i) Paratill bentleg shanks, (ii) Terramax bentleg shanks, and (iii) KMC straight shanks. A portable tillage profiler was used to measure both above- and belowground soil disruptions. Shallower subsoiling resulted in reduced subsoiling forces and reduced surface soil disturbance. The bentleg subsoilers provided maximum soil disruption and minimal surface disturbance and allowed surface residue to remain mostly undisturbed. Bentleg shanks provide optimum soil conditions for conservation systems by disrupting compacted soil profiles while leaving crop residues on the soil surface to intercept rainfall and prevent soil erosion.

(Download PDF)    (Export to EndNotes)