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Assessing the Reflective Characteristics of Palmer Amaranth (Amaranthus palmeri) and Pitted Morningglory (Ipomoea lacunosa) Accessions

Published online by Cambridge University Press:  20 January 2017

Cody J. Gray ,
David R. Shaw ,
Jason A. Bond ,
Daniel O. Stephenson IV  and
Lawrence R. Oliver
Cody J. Gray
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
David R. Shaw*
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
Jason A. Bond
Affiliation:
Mississippi State University, Delta Research and Extension Center, Stoneville, MS 38776
Daniel O. Stephenson IV
Affiliation:
University of Arkansas, Northeast Arkansas Research and Extension Center, Keiser, AR 72351
Lawrence R. Oliver
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701
*
Corresponding author's E-mail: [email protected]
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Abstract

A hand-held hyperspectral radiometer was used to measure differences in reflectance characteristics of 24 Palmer amaranth and 15 pitted morningglory accessions collected from the central and southern United States. A hyperspectral reflectance reading was collected from two mature leaves at 24 and 27 d after emergence (DAE) for each accession. Two analysis techniques, linear discriminant analysis and best spectral-band combination (BSBC) analysis, were performed using various vegetation indices, spectral bands, and individual wavelengths. Differentiation of individual accessions was difficult. Palmer amaranth accession classification accuracies were < 50% using both analysis techniques, except one accession collected in South Carolina (63%), when pooled over data acquisition dates. Pitted morningglory accession classification accuracies were also generally < 50%. Classification accuracies were higher using BSBC analysis at 24 DAE; however, at 27 DAE only one accession resulted in classification accuracy > 30%. These results suggest there are only slight reflectance differences within Palmer amaranth and pitted morningglory accessions. These differences may not be predictable based upon accession origin because of the genetic diversity of Palmer amaranth and pitted morningglory. However, differentiation between Palmer amaranth and pitted morningglory was 100%. Thus, spectral sensors used to differentiate between Palmer amaranth and pitted morningglory do not need to be calibrated for a particular region of the United States, and differentiation between these two species can be made using reflectance characteristics.

Keywords

Palmer amaranth,Amaranthus palmeri S. Wats. AMAPApitted morninggloryIpomoea lacunosa L. IPOLAClassification accuracieshyperspectral reflectanceremote sensingweed differentiation
Type
Weed Biology and Ecology
Information
Weed Science , Volume 55 , Issue 4 , August 2007 , pp. 293 - 298
Copyright
Copyright © Weed Science Society of America 

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