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Using high resolution UAV thermal imagery to assess the variability in the water status of five fruit tree species within a commercial orchard

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Abstract

This paper deals with the assessment of heterogeneity in water status in a commercial orchard, as a prerequisite for precision irrigation management. Remote sensing-derived indicators could be suitable for mapping water stress over large areas, and recent studies have demonstrated that high resolution airborne thermal imagery enables the assessment of discontinuous canopies as pure tree crowns can be targeted, thus eliminating the background effects. Airborne campaigns were conducted over a drip-irrigated commercial orchard in Southwestern Spain composed of five different orchard tree crops. An unmanned aerial vehicle with a thermal camera onboard was flown three times during the day on 8 July 2010, at 9, 11 and 13 h (local time). Stem water potential was measured at the same time of the flights. In some irrigation units, irrigation was stopped prior to the measurement date to induce water deficits for comparative purposes. Several approaches for using the thermal data were proposed. Daily evolution of the differential between canopy and air temperature (T c  − T a ) was compared to tree water status. The slope of the evolution of T c  − T a with time was well correlated with water status and is proposed as a novel indicator linked with the stomatal behavior. The Crop Water Stress Index (CWSI) was calculated with the temperature data from the 13.00 h flight using an empirical approach for defining the upper and lower limits of T c  − T a . The assessment of variability in water status was also performed using differences in relative canopy temperatures. Ample variability was detected among and within irrigation units, demonstrating that the approach proposed was viable for precision irrigation management. The assessment led to the identification of water-stressed areas, and to the definition of threshold CWSI values and associated risks. Such thresholds may be used by growers for irrigation management based on crop developmental stages and economic considerations.

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Acknowledgments

Authors acknowledge K. Gutierrez, D. Notario, R. Romero and A. Vera for their technical support. This work was funded by the Spanish Ministry of Science and Innovation for the projects CONSOLIDER CSD2006-0067 and AGL2009-13105. We are also grateful to the SIRRIMED (KBBE-2009-1-2-03) project for providing funds to finance this research. D.S. Intrigliolo and P.A. Nortes acknowledge the financial support received from the Spanish Ministry of Economy and Competitiveness program “Ramón y Cajal” and “Juan de la Cierva”.

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Authors and Affiliations

  1. Instituto de Agricultura Sostenible (IAS), Consejo Superior de Investigaciones Científicas (CSIC), Alameda del Obispo s/n, 14004, Córdoba, Spain

    V. Gonzalez-Dugo, P. Zarco-Tejada & E. Fereres

  2. Dept Riego, Centro de Edafología y Biología Aplicada del Segura (CEBAS), Consejo Superior de Investigaciones Científicas (CSIC), Espinardo, P.O. Box 164, 30100, Murcia, Spain

    E. Nicolás, P. A. Nortes & J. J. Alarcón

  3. Centro Desarrollo Agricultura Sostenible, Instituto Valenciano Investigaciones Agrarias (IVIA), P.O. Box 46113, Moncada, Valencia, Spain

    D. S. Intrigliolo

  4. Department of Agronomy, University of Cordoba, Campus Universitario de Rabanales, 14014, Córdoba, Spain

    E. Fereres

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  1. V. Gonzalez-Dugo
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  2. P. Zarco-Tejada
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  3. E. Nicolás
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  4. P. A. Nortes
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  5. J. J. Alarcón
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  6. D. S. Intrigliolo
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  7. E. Fereres
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Correspondence to V. Gonzalez-Dugo.

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Gonzalez-Dugo, V., Zarco-Tejada, P., Nicolás, E. et al. Using high resolution UAV thermal imagery to assess the variability in the water status of five fruit tree species within a commercial orchard. Precision Agric 14, 660–678 (2013). https://doi.org/10.1007/s11119-013-9322-9

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  • DOI: https://doi.org/10.1007/s11119-013-9322-9

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