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    Heat Unit Based Crop Coefficient for Grapefruits Trees

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    Author
    Hla, A. K.
    Martin, E. C.
    Waller, P.
    Slack, D. C.
    Issue Date
    1996-09
    Keywords
    Agriculture -- Arizona
    Citrus fruits -- Arizona
    Grapefruits -- Arizona
    
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    Publisher
    College of Agriculture, University of Arizona (Tucson, AZ)
    Journal
    Citrus Research Report
    Abstract
    Using portable sap flow sensors, the onset and volume of sap moving up the branches of grapefruit (Citrus Paradisi Macfadyen) trees was monitored on an hourly basis. Reference evapotranspiration (ETo) data was obtained from The Arizona Meteorological Network (AZMET). Crop evapotranspiration (ETc) was estimated from soil moisture measurements using a neutron probe. The threshold temperature limits were delineated from an evaluation of the hourly sap flow responses to cold winter and extreme summer temperatures. The heat based crop curve was derived from a correlation of the crop coefficients with heat unit over one crop year. The heat based crop coefficients were found to be similar to crop coefficients derived by other researchers.
    Series/Report no.
    Series P-105
    370105
    Sponsors
    Citrus Research Council
    Collections
    Citrus Research Report 1996

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