1. Extension Irrig. Specialist, Cooperative Extension and Dept. of Land, Air and Water Resour., Univ. of California, Davis, CA 95616.
2. Asst. Prof., Dept. of Agric. and Food Engrg., Indian Inst. of Technol., Kharagpur, WB 721 302, India.
3. Prof., Dept. of Biol. and Agric. Engrg. and Dept. of Land, Air and Water Resour., Univ. of California, Davis, CA.