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    Imaging Spectroscopy for On-Farm Measurement of Grassland Yield and Quality

    Access Status
    Open access via publisher
    Authors
    Schut, Antonius
    Van Der Heijden, G.
    Hoving, I.
    Stienezen, M.
    van Evert, A.
    Meuleman, J.
    Date
    2006
    Type
    Journal Article
    
    Metadata
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    Citation
    Schut, A.G.T. and Van Der Heijden, G.W.A.M. and Hoving, I. and Stienezen, M.W.J and van Evert, F.K. and Meuleman, J. 2006. Imaging Spectroscopy for On-Farm Measurement of Grassland Yield and Quality. Agronomy Journal. 98 (5): pp. 1318-1325.
    Source Title
    Agronomy Journal
    DOI
    10.2134/agronj2005.0225
    ISSN
    1435-0645
    School
    Department of Spatial Sciences
    Remarks

    Co-publisher with Crop Science Society of America and Soil Science Society of America

    URI
    http://hdl.handle.net/20.500.11937/17082
    Collection
    • Curtin Research Publications
    Abstract

    Grassland management has a large influence on the operating cost and environmental impact of dairy farms and requires accurate, detailed, and timely information about the yield and quality of grass. Our objective was to evaluate imaging spectroscopy as a means to obtain accurate, detailed, and rapid measurements of grass yield and quality. The work consisted of three steps. In the first step, a new mobile measurement system comprising several hyperspectral sensors was constructed and calibrated on measurements collected in six field experiments in the Netherlands in 2 yr. A partial least squares regression model was used to fit parameters derived from hyperspectral images to values of DM (dry matter) yield and quality obtained through destructive sampling. Leave-k-out cross validation showed relative errors of prediction of 8 to 22% (167-477 kg DM ha-1 absolute) for DM yield, 21% (0.07 absolute) for the fraction of clover in DM, 6 to 12% for nutrient concentration, 15 to 16% for sugar concentration, and 3 to 5% for feeding values.In the second step, the measurement system was used to predict grassland yield and quality on fields from two farms. In the third step, the absence of calibration data for a specific date was simulated with a leave-harvest-out procedure. Predictions of absolute values were strongly biased due to system instability. Prediction of relative values was good, with a mean absolute error of 183 kg ha-1 for DM yield. The instability of the measurement system requires that duosampling must be used for prediction of absolute values.

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