The Brent Tremor subsoiler's parabolic-style shanks and heavy-duty, all-welded, double-frame design - with a 6 x 6" rear bar - provide maximum hardpan fracture and soil disturbance, according to Unverferth Manufacturing, Kalida, OH.

Swivel coulters with 20"-diameter rippled blades feature 1,500 lbs of down pressure for constant penetration, even in heavy soil. Shanks, at 1 11/44" wide x 5" deep and set on 30" spacings, fracture hardpan up to 20" deep, with 20" to 40" adjustable spacing.