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Title: EVALUATION OF HYPERSPECTRAL FLURESCENCE AND REFLECTANCE MEASUREMENTS OF VEGETATION DETECTION AND NITROGEN DEFICIENCY MONITORING

Author
item CAMPBELL, P. - NASA GSFC
item MIDDLETON, E. - NASA GSFC
item CORP, L. - NASA GSFC
item McMurtrey Iii, James
item CHAPPELLE, E. - NASA GSFC

Submitted to: Geospatial Information in Agriculture and Forestry International Conference
Publication Type: Proceedings
Publication Acceptance Date: 11/26/2001
Publication Date: 11/5/2001
Citation: N/A

Interpretive Summary: Optimal approaches for using a combination of both fluorescence and reflectance sensing to evaluate vegetation status and function during precision agriculture fertilizer applications were the objectives of the studies. Both reflectance and fluorescence measurements have shown promise in the remote determination of nutrient supply in crop canopies. Current methods for site specific fertilizer application could be enhanced by combining hyperspectral reflectance and fluorescence emission technologies.

Technical Abstract: An evaluation of hyperspectral fluorescence and reflectance techniques for detecting nitrogen fertilizer treatment levels in corn were investigated. Fluorescence and reflectance measurements were compared for the ability to detect changes in foliar pigment concentration, N and C content occurring with nutrient deficiency, and to discriminate levels of nitrogen application in field-grown corn were compared. Fluorescence indices trende to be able to detect optimal nitrogen fertilization levels there as reflectance indices were able to detect nitrogen deficiencies. The possibility of combining hyperspectral reflectance and fluorescence emission technologies for site specific fertilizer application is suggested.