Received for publication 12 May 1986. I thank Frank H. Takatori, Univ. of California, Riverside, for his helpful advice in the initiation of this study. Appreciation is also extended to Michael C. Shannon for osmotic potential and total soluble solids measurements and Donald A. Layfield for elemental analyses of the plant tissues. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.