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ABSTRACT CONVENTIONAL, parabolic, and triplex subsoilers were operated on a uniform test site to evaluate the effect of ground speed and subsoiler shape on power requirement. Results indicated that a single parabolic subsoiler required less draft force and power to operate than a single conventional or triplex subsoiler. Power required for the triple subsoiler was slightly higher than that for the conventional subsoiler. The largest vertical force (downward) and smallest wheel slip values were observed for the parabolic subsoiler.