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    Early detection of drought stress in grass swards with imaging spectroscopy

    Access Status
    Open access via publisher
    Authors
    Schut, Antonius
    Ketelaars, J.
    Date
    2003
    Type
    Journal Article
    
    Metadata
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    Citation
    Schut, A.G.T. and Ketelaars, J.J.M.H. 2003. Early detection of drought stress in grass swards with imaging spectroscopy. NJAS - Wageningen Journal of Life Sciences. 51 (3): pp. 319-337.
    Source Title
    NJAS - Wageningen Journal of Life Sciences
    DOI
    10.1016/S1573-5214(03)80022-2
    School
    Department of Spatial Sciences
    URI
    http://hdl.handle.net/20.500.11937/40379
    Collection
    • Curtin Research Publications
    Abstract

    The potential of an experimental imaging spectroscopy system with high spatial (0.28-1.45 mm2) andspectral (5-13 nm) resolution was explored for early detection of drought stress in grass. A climate chamber experiment was conducted with nine Lolium perenne L. mini swards with drought stress treatments at two nitrogen levels. Images were recorded once every two days. Growth was monitored by changes in ground cover (GC), index of reflection intensity (IRI) and wavelength position of and gradient at inflection points, as estimated from images. Drought stress increased leaf dry matter and sugar content. Drought stress decelerated and ultimately reversed GC evolution, and kept IRI at low values. In contrast to unstressed growth, all absorption features narrowed and became shallower under drought stress. The inflection points near 1390 and 1500 nm were most sensitive to drought stress. Differences between drought stress and control swards were detected shortly before leaf water content dropped below 80%. The evolution of inflection point wavelength positions reversed under drought stress, except for the inflection point at the red edge where the shift to longer wavelengths during growth accelerated. The relation between inflection points at 705 and 1390 nm differentiated unstressed swards at an early growth stage from drought-stressed swards in a later growth stage.

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