Received for publication Jan 14, 1982.
Visiting scientist. Permanent address: Institute of Soils and Water, The Volcani Center, P.O. Box 6, Bet Dagan, Israel.
We express our appreciation to Lambda Instruments Co. of Lincoln, Neb., for making the measurements of spectral distribution, and thank A. Genizi of the Volcani Center for help in the statistical analysis.
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