T. W. Katsvairo, D. L. Wright, J. J. Marois, D. Hartzog, P. J. Wiatrak, and J. R. Rich, “Sod-Based Peanut/Cotton Rotation-Soil Health Part 1: Root Depth, Earthworms and Soil Water Infiltration: SS-AGR-124/AG256, 7/2006”, EDIS, vol. 2006, no. 14, Aug. 2006.