Use of infrared thermometry to measure canopy-air temperature difference at partial cover to assess crop water stress index

Persistent Link:
http://hdl.handle.net/10150/191890
Title:
Use of infrared thermometry to measure canopy-air temperature difference at partial cover to assess crop water stress index
Author:
Almeida, Julio Augusto Pires,1958-
Issue Date:
1986
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
A study on the potential for extracting canopy temperature from composite scenes of plant and soil background using infrared thermometry was carried out. Using field and laboratory data, Heilman's equation was tested for its sensitivity and ability to predict actual canopy temperature. Using Idso's approach, crop water stress index values were calculated for partial and full canopies. The study showed that under partial canopy situations calculated leaf temperature is very sensitive to soil background and composite scene temperatures and moderately sensitive to canopy emissivity and cover. Negative values as well as values greater than unity for crop water stress index were calculated for partial canopy conditions. Negative values were also reported for the full canopy cover conditions thus, establishing a need for better estimates of data used in calculation of crop water stress index values. Infrared thermometry does not show much promise as an irrigation scheduling technique for canopies under partial cover using the approach investigated in this study.
Type:
Thesis-Reproduction (electronic); text
LCSH Subjects:
Hydrology.; Infrared equipment.; Crops and water -- Measurement.
Degree Name:
M.S.
Degree Level:
masters
Degree Program:
Agricultural Engineering; Graduate College
Degree Grantor:
University of Arizona
Committee Chair:
Slack, Donald C.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleUse of infrared thermometry to measure canopy-air temperature difference at partial cover to assess crop water stress indexen_US
dc.creatorAlmeida, Julio Augusto Pires,1958-en_US
dc.contributor.authorAlmeida, Julio Augusto Pires,1958-en_US
dc.date.issued1986en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractA study on the potential for extracting canopy temperature from composite scenes of plant and soil background using infrared thermometry was carried out. Using field and laboratory data, Heilman's equation was tested for its sensitivity and ability to predict actual canopy temperature. Using Idso's approach, crop water stress index values were calculated for partial and full canopies. The study showed that under partial canopy situations calculated leaf temperature is very sensitive to soil background and composite scene temperatures and moderately sensitive to canopy emissivity and cover. Negative values as well as values greater than unity for crop water stress index were calculated for partial canopy conditions. Negative values were also reported for the full canopy cover conditions thus, establishing a need for better estimates of data used in calculation of crop water stress index values. Infrared thermometry does not show much promise as an irrigation scheduling technique for canopies under partial cover using the approach investigated in this study.en_US
dc.description.notehydrology collectionen_US
dc.typeThesis-Reproduction (electronic)en_US
dc.typetexten_US
dc.subject.lcshHydrology.en_US
dc.subject.lcshInfrared equipment.en_US
dc.subject.lcshCrops and water -- Measurement.en_US
thesis.degree.nameM.S.en_US
thesis.degree.levelmastersen_US
thesis.degree.disciplineAgricultural Engineeringen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.chairSlack, Donald C.en_US
dc.identifier.oclc213341330en_US
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