1. Assistant Professor, Dept. of Animal and Rangeland Sciences, Oregon State Univ., 112 Withycombe Hall, Corvallis, OR 97331-6702; formerly, Research Assistant Professor, Dept. of Animal and Range Sciences, New Mexico State Univ., P.O. Box 30003, MSC 3I, Las Cruces, NM 88003 (corresponding author).
2. Professor, Dept. of Animal and Range Sciences, New Mexico State Univ., P.O. Box 30003, MSC 3I, Las Cruces, NM 88003.
3. Professor, Sustainable Agriculture Science Center, New Mexico State Univ., P.O. Box 159, Alcalde, NM 87511.
4. Senior Member of the Technical Staff, Geohydrology Dept., Sandia National Laboratories, P.O. Box 5800, Albuquerque, NM 87185.
5. Associate Professor, Dept. of Plant and Environmental Sciences, New Mexico State Univ., P.O. Box 30003, MSC 3Q, Las Cruces, NM 88003.