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Approach to assess infrared thermal imaging of almond treesunder water-stress conditions

Published online by Cambridge University Press:  12 October 2012

Iván García-Tejero ,
Víctor Hugo Durán-Zuazo ,
Javier Arriaga ,
Almudena Hernández ,
Luisa Maria Vélez  and
José Luis Muriel-Fernández
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Abstract

Introduction. Optimising agricultural water use implies thecombination of physiological, technological and engineering techniques, especially thosefor continuously monitoring the water status of plants subjected to deficit irrigation. Amethodology to estimate water stress of young almond trees from thermal images wasdeveloped based on assessing the physiological status of almond crops under limitedwater-supply conditions. Materials and methods. Two irrigation treatmentswere tested during the maximum evapotranspirative demand period (214th to the 243rd day ofthe year) in an experimental almond [Prunus dulcis (Mill) D.A. Webb, cv.Guara] orchard: a low-frequency deficit irrigation (LFDI) treatment, irrigated accordingto the plant-water status, and a fully irrigated treatment (C100) at 100% of cropevapotranspiration. Daily canopy temperature at midday (TC) was measured with an infraredcamera, together with standard measurements of stem-water potential (ΨStem) and stomatalconductance (gS). The time course of these parameters and their relationships wereanalysed. Results and discussion. The time course of the parameters studiedshowed highly significant correlations among the differentials of canopy-air temperature(ΔT), ΨStem and gS. The methodological protocol for analysing thermal images allowed atime saving in processing information and additionally offered the possibility ofestimating the ΨStem and gS values. Conclusion. Our results confirm thatinfrared thermography is a suitable technique for assessing the crop-water status and canbe used as an important step towards automated plant-water stress management in almondorchards.

Keywords

SpainPrunus dulciscanopytemperatureinfrared thermographywater requirementssoil water deficitEspagnePrunus dulciscouverttempératurethermographie infrarougebesoin en eaudéficit hydrique du solEspañaPrunus dulciscubierta de copastemperaturatermografía infrarrojanecesidades de aguadéficit de humedad en el suelo
Type
Original article
Information
Fruits , Volume 67 , Issue 6 , October 2012 , pp. 463 - 474
Copyright
© 2012 Cirad/EDP Sciences

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