1. Department of Land, Air, and Water Resources, University of California, Davis, CA 95616, USA Tel: (530) 752-0630 Fax: (530) 752-5262 atchow@ucdavis.edu; radahlgren@ucdavis.edu
2. USDA-ARS, Water Management Research Laboratory, 9611 S Riverbend AveParlier, CA 93648, USA Tel: (559) 596-2870 Fax: (559) 596-2851 e-mail: sgao@fresno.ars.usda.gov