Co-Authors:
Klein, I., Department of Pomology, University of California, Davis, CA, 95616, United States
Weinbaum, S.A., Department of Pomology, University of California, Davis, CA, 95616, United States
Abstract:
Regression equations relating volume of urea solutions retained on leaves initially and leaf area were developed to assess urea deposition nondestructively and facilitate measurement of urea uptake by leaves of olive (Pleaeuropaea L.) and almond [Primusdulcis (Mill.) D.A. Webb], Foliar uptake of urea was slower in olive than it was in almond, but uptake in both species was proportional to the concentration of the urea applied. Foliar uptake of urea was not influenced by previous applications. No phytotoxicity was apparent in almond and olive following single applications of 0.5% w/v urea and 4% (w/v), respectively. Approximately 15 times more urea could be applied per cm of an olive leaf than per cm of an almond leaf at the threshold of phytotoxicity. Leaf N content in olive was increased 47% with minimal phytotoxicity following 5 successive foliar applications of 2% urea within ten days. © 1985, Taylor & Francis Group, LLC. All rights reserved.
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