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Timing Effects of Deep Tillage on Penetration Resistance and Wheat and Soybean Yield

^a USDA-ARS, Coastal Plain Research Center, 2611 W Lucas St., Florence, SC 29501-1242 USA
^b Clemson Univ., 2200 Pocket Rd., Pee Dee Res. Center, Florence, SC 29506-9706 USA

View larger version (31K): [in a new window]   Fig. 1 Cone index contours for the spring 1995 soybean planting (disked treatment). The time of deep tillage is (a) none, (b) spring, (c) fall, or (d) both spring and fall. Readings were taken from non-wheel track position under the center of the tractor to a wheel track

View larger version (28K): [in a new window]   Fig. 2 Cone index contours for the spring 1995 soybean planting (non-disked treatment). The time of deep tillage is (a) none, (b) spring, (c) fall, or (d) both spring and fall

View larger version (20K): [in a new window]   Fig. 3 Yield decrease with increase of cone index analyzed on a season-by-season basis. Data points are means over four replications for each of the eight surface and deep tillage treatments