COMPARISON OF YEARLY VARIATION IN FLORIDA CITRUS POUNDS SOLIDS PRODUCTION TO SEASONAL CLIMATIC VARIATION

in HortScience
Author: L. G. Albrigo1
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  • 1 Citrus Research and Education Center, University of Florida - IFAS, Lake Alfred, FL 33850

In Florida, pounds soluble solids per box (% soluble solids × % juice × weight) can be 60% higher in some years compared to the lowest years. Pounds solids, soluble solids and juice content data were obtained for the different citrus growing districts in Florida for a 20-year period from the USDA and Florida Agricultural Statistics Service. Weather data for each district was obtained from US National Weather Service records. Total rainfall and average daily temperature were calculated for 2–month periods from prior to the normal bloom period until harvest. Juice data was regressed against weather data and the previous years pounds solids using a stepwise multiple regression program. R2 values for early oranges, `Marsh Seedless' grapefruit and `Valencia' were 0.48, 0.48 and 0.72, respectively. Prebloom and bloom rainfall and temperatures were frequently positively correlated, while summer rainfall often was a negatively correlated independent variable to final pounds solids. Additional data and physiological implications will be discussed.

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