Traverse draft measured with the dynamometer was compared to the estimated draft calculated using Eq. (1) (ASABE Standards, 2009a). The implement used for the estimated draft was a
subsoiler, narrow point. The machine parameters selected for use in Eq. (1) were A = 226, B = 0, and C = 1.8 while the soil parameter selected was F2 (= 0.70; medium textured soil). Since both implements were setup similarly, W= 6 (tools or points) and T = 33.02 cm. The measured ground speed was used in these calculations with the percent difference of the estimated draft from the actual computed for comparison.