Wednesday, November 7, 2007
309-2

Alternating Paratil Shank Placement for Enhanced Subsurface Soil Disruption.

Francisco J. Arriaga1, Randy L. Raper1, Kipling S. Balkcom1, and Ted S. Kornecki2. (1) USDA-ARS, 411 S Donahue Dr, Auburn, AL 36832, (2) USDA-ARS National Soil Dynamics Laboratory, Auburn University, AL 36849

Conservation tillage operations with a paratill are usually conducted with the shanks placed in the same location year after year, disrupting the same volume of soil. Moving the location of the shanks on the toolbar so they are inverted from the previous year's location can potentially increase the volume of disrupted soil below ground. This can potentially create more favorable conditions for soil water redistribution into the root zone, while increasing soil rooting volume. The objective was to study the alternating placement of paratill shanks on below ground disruption. No differences in corn yields have been observed in the first two years, but cotton yields were 7 and 32% greater in 2005 and 2006, respectively. Soil penetration resistance data collected at the end of both seasons suggest that the alternating shank location treatment loosens a greater volume of soil.