1. Post-Doctoral Researcher, Univ. of Idaho Research and Extension Center, 3793 N. 3600 E., Kimberly, ID 83341.
2. Professor, Water Resources Engineering, Univ. of Idaho Research and Extension Center, 3793 N. 3600 E., Kimberly, ID 83341.
3. Associate Professor, Univ. of the Andes, Merida, Venezuela.
4. Soil Scientist, USDA-ARS Northwest Irrigation and Soils Research Laboratory, 3793 N. 3600 E., Kimberly, ID 83341.