1. Dep. Agronomy; Oklahoma State Univ.
2. USDA-ARS; Water Quality and Watershed Research Laboratory; P.O. Box 1430 Durant Oklahoma 74702-1430
3. Dep. Agronomy and Soil Science; Univ. Hawaii; Honolulu Hawaii 96822
4. USDA-SCS-SMSS; National Soil Survey Lab.; Lincoln Nebraska 68508-3866