1Received for publication December 9, 1980.
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.
2Present address: Dept. of Horticulture, Univ. of Menufia, Shebin Elkom, Egypt.
3We acknowledge with thanks the technical assistance of Lynda Delph.
4Department of Plant Science.
5Department of Soils, Water, and Engineering.
1018 Duke Street
Alexandria, VA 22314
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