1. Land Resources and Environmental Science Dep.Montana State Univ.334 Leon Johnson HallBozemanMT59717
2. USDA‐ARSGeorge E. Brown, Jr. Salinity Laboratory450 W. Big Springs Rd.RiversideCA92507
3. Dep. of Biological and Agricultural Engineering, 301 Scoates HallTexas A&M Univ.College StationTX77843‐2117