1. School of Ocean and Earth Science and Technology, Hawaii Institute of Geophysics, Univ. of Hawaii; 2525 Correa Rd. Honolulu HI 96822
2. Dep. of Agronomy and Soil Science; Univ. of Hawaii; Honolulu HI 96822
3. Dep. of Soil Plant and Atmospheric Sciences; Cornell Univ.; Ithaca NY 14853