Abstract
The onset and rate of sap moving up the branches of grapefruit (Citrus paradisi Macfadyen) trees weremonitored hourly using portable sap flow sensors at Waddell, Arizona. Hourly reference evapotranspiration (ETo)estimates were calculated using data from a nearby weather station. Crop water use was estimated from soil moisturemeasurements using a neutron probe. These data were used to first delineate the upper and lower temperature thresholdvalues for the determination of heat units. A heat unit-based crop coefficient was then derived from a correlation of thecrop coefficient with heat units over a crop year. The heat unit-based crop coefficient was found to be similar to cropcoefficients derived by other researchers.
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