Two deep tillage implements were used and represented typicalsubsoilers used in the southeastern US to alleviate soil compaction while minimizing surface disruption: a KMC Generation I Rip-Strip subsoiler (Fig. 1) and a Bigham Brothers Paratill TM . Both implements were three-point hitch or integral mounted and configured for six-rows (i.e., 6 shanks) having 5.5-m working widths. The KMC implement had a straight shank design with the Paratill TM a bentleg design (Fig. 2). A typical setup for on-farm use was used with appropriate loadings for a John Deere 8300 (149-kW PTO power rating; Deere and Company, Moline, IL). The power ratings for these implements were 22–30 kW per shank for the Paratill TM (Bigham Brothers, 2009) and 19–22 kW per shank for the KMC Generation I Rip-Strip subsoiler (Sumner, 2007)