A practical method using a network of fixed infrared sensors for estimating crop canopy conductance and evaporation rate

Hamlyn G. Jones (Lead / Corresponding author), Paul A. Hutchinson, Tracey May, Hizbullah Jamali, David M. Deery

    Research output: Contribution to journalArticle

    17 Citations (Scopus)
    160 Downloads (Pure)

    Abstract

    We describe the development and testing of a novel thermal infrared sensor incorporating a dry reference surface for incorporation into field wireless sensor networks (WSNs) that allows the estimation of absolute transpiration rates and canopy conductance. This 'dry reference' sensor provides a physical reference surface that mimics the temperature of a non-transpiring canopy and can therefore be used in conjunction with canopy temperature to estimate either canopy transpiration or canopy conductance. The dry reference sensor is based on a hemispherical surface that mimics the distribution of shaded and sunlit leaves in non-transpiring canopy. Three dry reference sensors were deployed in a commercial cotton crop from which canopy transpiration and conductance was estimated for the entire season. We provide evidence that fixed infrared sensors with a dry reference surface, when combined with limited meteorological data, can provide useful continuous monitoring of crop water use and canopy conductance that is potentially of value for irrigation management and crop phenotyping applications. Key to the success of this dry sensor application is the requirement that the spectral absorptance of the sensor is tailored to match the crop of interest.

    Original languageEnglish
    Pages (from-to)59-69
    Number of pages11
    JournalBiosystems Engineering
    Volume165
    Early online date21 Oct 2017
    DOIs
    Publication statusPublished - Jan 2018

    Keywords

    • Canopy conductance
    • Evapotranspiration
    • Infrared thermometry
    • Irrigation scheduling
    • Reference surfaces
    • Stomatal conductance

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