Heat unit-based crop coefficient for grapefruit trees

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The onset and rate of sap moving up the branches of grapefruit (Citrus paradisi Macfadyen) trees were monitored 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 moisture measurements using a neutron probe. These data were used to first delineate the upper and lower temperature threshold values for the determination of heat units. A heat unit-based crop coefficient was then derived from a correlation of the crop coefficient with heat units over a crop year. The heat unit-based crop coefficient was found to be similar to crop coefficients derived by other researchers.

Original languageEnglish (US)
Pages (from-to)485-489
Number of pages5
JournalApplied Engineering in Agriculture
Volume13
Issue number4
StatePublished - Jul 1997

Fingerprint

Citrus paradisi
crop coefficient
grapefruits
Crops
Hot Temperature
heat
neutron probes
weather stations
crop year
sap flow
Neutrons
Weather
sap
sensors (equipment)
evapotranspiration
Evapotranspiration
Soil
researchers
Soil moisture
Research Personnel

Keywords

  • Citrus
  • Crop water use
  • Growing degree days
  • Sap flow
  • Threshold temperature

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)

Cite this

Heat unit-based crop coefficient for grapefruit trees. / Martin, Edward C; Hla, A. K.; Waller, Peter M; Slack, Donald C.

In: Applied Engineering in Agriculture, Vol. 13, No. 4, 07.1997, p. 485-489.

Research output: Contribution to journalArticle

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