Figure D: Aerial view of long-term tillage plots at the Upper Piedmont Research Station, Reidsville, NC showing 0.61 m contours (blue lines) and soil map units. The site has sloping (~5%) topography typical of the southern Piedmont region. Replicate blocks (B1…B4) are oriented NW-SE across the contour. Soil type: Wedowee (Casville) sandy loam. Figure E: Long-term tillage plots at Reidsville, NC. Foreground: no-till planted corn. These plots have been in continuous corn, or corn-soybean rotation, since 1984 with controlled traffic.