D. NangjuInternational Institute of Tropical Agriculture, Ibadan, Nigeria
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Contributor Notes
Received for publication August 8, 1978.
The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
Present address: Agronomist, Asian Development Bank, P.O. Box 789, Manila Philippines.