Dept. of Field Crops, Inst, of Field and Garden Crops, ARO.
Dept. of Ornamentals, Inst, of Field and Garden Crops, ARO.
Received for publication 13 Jan. 1984. Contribution from the Agricultural Research Organization, The Volcani Center, POB 6, Bet Dagan 50250, Israel. No. 951-E, 1983 series. 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.