Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Imaging spectroscopy for early detection of nitrogen deficiency in grass swards

    Access Status
    Open access via publisher
    Authors
    Schut, Antonius
    Ketelaars, J.
    Date
    2003
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Schut, A.G.T. and Ketelaars, J.J.M.H. 2003. Imaging spectroscopy for early detection of nitrogen deficiency in grass swards. NJAS - Wageningen Journal of Life Sciences. 51 (3): pp. 297-317.
    Source Title
    NJAS - Wageningen Journal of Life Sciences
    DOI
    10.1016/S1573-5214(03)80021-0
    ISSN
    1573-5214
    School
    Department of Spatial Sciences
    URI
    http://hdl.handle.net/20.500.11937/25208
    Collection
    • Curtin Research Publications
    Abstract

    The potential of an experimental imaging spectroscopy system with high spatial (0.16-0.28 mm2) and spectral resolution (5-13 nm) was explored for early detection of nitrogen (N) stress. From June through October 2000, a greenhouse experiment was conducted with 15 Lolium perenne L. mini-swards and 5 N treatments. Images were recorded twice a week. With the experimental system, spectra of grass leaves in the canopy can be obtained. Treatment effects on ground cover (GC) and changes in leaf spectral characteristics were studied separately. Leaf pixels with similar reflection intensity were grouped in intensity classes (IC). An index of reflection intensity (IRI) indicates the percentages of strongly reflecting grass pixels. Blue edge, green edge and red edge positions were calculated for each IC. Both GC and IRI increased until harvest, with largest increases for liberal N treatments. The width of the chlorophyll-dominated absorption band around 680 nm (CAW) increased up to a maximum of 133 nm for both liberal and limited N in the first two weeks after harvesting. CAW decreased for limited N in the second half of the growth period in contrast to liberal N. At harvest CAW explained 95% of the variation in relative dry matter (DM) yield between treatments. Principal component analyses showed an intertwined response of the principal components to both DM yield and N content. Edge positions changed strongly with IC. Possible effects of sensor characteristics, canopy geometry, leaf angle and changes in leaf characteristics with canopy position on the observed relation between IC and edge position are discussed.

    Related items

    Showing items related by title, author, creator and subject.

    • Nondestructive Phenomic Tools for the Prediction of Heat and Drought Tolerance at Anthesis in Brassica Species
      Stefanova, Katia ; Chen, S; Guo, Y; Sirault, X; Saradadevi, R; Turner, N; Nelson, M; Furbank, R; Siddique, S; Cowling, W (2019)
      Oilseed Brassica species are vulnerable to heat and drought stress, especially in the early reproductive stage. We evaluated plant imaging of whole plant and flower tissue, leaf stomatal conductance, leaf and bud temperature, ...
    • Early detection of drought stress in grass swards with imaging spectroscopy
      Schut, Antonius; Ketelaars, J. (2003)
      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 ...
    • The effectiveness of cabbage leaf application (treatment) on pain and hardness in breast engorgement and its effect on the duration of breastfeeding
      Wong, B.; Koh, S.; Hegney, Desley; He, H. (2012)
      Background: Breast engorgement is a condition that affects breastfeeding mothers early in the postpartum. The discomfort and tenderness as a result of the engorgement is a major contributing factor to the early cessation ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.