Received for publication July 6, 1978.
We are grateful to Mr. John E. Pherson, Farm Advisor, University of California, Agr. Extension Service, Visalia, CA; Mr. Myron Smith, owner of ‘Valencia’ orange property, Terra Bella, CA; Mr. Warren Ludi for laboratory assistance in determining the chlorophyll and carotenoids; and Mr. Saul Camacho for assistance in determining soil surface temperature.
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