Received for publication December 22, 1975.
Present address: EMBRAPA, Brasilia, DF, Brasil. A fellowship awarded to the senior author by the Calouste Gulbenkian Foundation, Lisbon, Portugal, is gratefully acknowledged. Thanks also are due to the Computing Center, University of California, Riverside, U.S.A. and the Council of Scientific and Industrial Research, Pretoria, South Africa; Dr. F. M. Turrell, for the use of a photoelectric apparatus to measure leaf areas; Mr. C. K. Huszar, who helped in determining some of the regressions; Mr. R. H. Burnett, for his assistance in the experimental work; Mrs. R. M. Moreno, Mrs. M. M. Recio and Mr. J. J. Morgadinho for help in checking and organizing of data.
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