Estimation of crop water stress index in almond orchards using thermal aerial imagery

Sagarika Roy, Duke Ophori

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

An important method for estimating Crop Water Stress Index (CWSI) is by measuring surface temperature of the canopy. A remote sensing method was used to estimate CWSI of an almond orchard in Paramount farm, California. An aerial remote measurement using MASTER (MODIS/ASTER) thermal band data used to measure canopy temperature (Tc). The empirical relationship for canopy- air temperatures difference (Tc-Ta) versus Vapor Pressure Deficit (VPD) represents the crop water stress quantitatively. The results implied that the average value of CWSI for well-irrigated (non-stressed) almonds is 0.24 while the almond yield is affected when the average CSWI values for stressed crop due to lack of irrigation is greater than 0.5. The difference in crop canopy to air temperature (Tc-Ta), measured was negatively related to the VPD [R2=0.96 and p<0.0001]. However, the relationship between (Tc-Ta) and VPD used to develop a non-stressed baseline equation for almonds, which estimates CWSI. Determination of CSWI is useful for irrigation scheduling and water management.

Original languageEnglish
JournalJournal of Spatial Hydrology
Volume12
Issue number1
StatePublished - 1 Jan 2014

Fingerprint

water stress
orchard
imagery
crop
vapor pressure
canopy
air temperature
irrigation
ASTER
index
MODIS
water management
surface temperature
farm
remote sensing
temperature

Keywords

  • Almond
  • Canopy
  • Crop water stress index
  • MASTER
  • Vapor pressure deficit

Cite this

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abstract = "An important method for estimating Crop Water Stress Index (CWSI) is by measuring surface temperature of the canopy. A remote sensing method was used to estimate CWSI of an almond orchard in Paramount farm, California. An aerial remote measurement using MASTER (MODIS/ASTER) thermal band data used to measure canopy temperature (Tc). The empirical relationship for canopy- air temperatures difference (Tc-Ta) versus Vapor Pressure Deficit (VPD) represents the crop water stress quantitatively. The results implied that the average value of CWSI for well-irrigated (non-stressed) almonds is 0.24 while the almond yield is affected when the average CSWI values for stressed crop due to lack of irrigation is greater than 0.5. The difference in crop canopy to air temperature (Tc-Ta), measured was negatively related to the VPD [R2=0.96 and p<0.0001]. However, the relationship between (Tc-Ta) and VPD used to develop a non-stressed baseline equation for almonds, which estimates CWSI. Determination of CSWI is useful for irrigation scheduling and water management.",
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Estimation of crop water stress index in almond orchards using thermal aerial imagery. / Roy, Sagarika; Ophori, Duke.

In: Journal of Spatial Hydrology, Vol. 12, No. 1, 01.01.2014.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Roy, Sagarika

AU - Ophori, Duke

PY - 2014/1/1

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AB - An important method for estimating Crop Water Stress Index (CWSI) is by measuring surface temperature of the canopy. A remote sensing method was used to estimate CWSI of an almond orchard in Paramount farm, California. An aerial remote measurement using MASTER (MODIS/ASTER) thermal band data used to measure canopy temperature (Tc). The empirical relationship for canopy- air temperatures difference (Tc-Ta) versus Vapor Pressure Deficit (VPD) represents the crop water stress quantitatively. The results implied that the average value of CWSI for well-irrigated (non-stressed) almonds is 0.24 while the almond yield is affected when the average CSWI values for stressed crop due to lack of irrigation is greater than 0.5. The difference in crop canopy to air temperature (Tc-Ta), measured was negatively related to the VPD [R2=0.96 and p<0.0001]. However, the relationship between (Tc-Ta) and VPD used to develop a non-stressed baseline equation for almonds, which estimates CWSI. Determination of CSWI is useful for irrigation scheduling and water management.

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