2.1. Test location and soil characteristics
Field experiments were conducted near Yoakum, Texas at the
Texas AgriLife Research site during the 2005 and 2006 growing
seasons and near Tifton, Georgia at the Ponder Farm in 2005. Soils
at Yoakum site were a Denhawken–Elmendorf complex (fine,
montmorillonitic, hyperthermic Vertic Ustochrepts–Argiustolls)
with less than 1% organic matter and pH 7.2 while soils at the
Ponder Farm were a Tifton sand (fine-loamy, kaolinic, thermic
Plinthic Kandiudults) with 1.2% organic matter and pH 6.0