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1 October 2003 Detecting Late-Season Weed Infestations in Soybean (Glycine max)
CLIFFORD H. KOGER, DAVID R. SHAW, CLARENCE E. WATSON, KRISHNA N. REDDY
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Abstract

Field experiments were conducted in 1999 at Stoneville, MS, to determine the potential of multispectral imagery for late-season discrimination of weed-infested and weed-free soybean. Plant canopy composition for soybean and weeds was estimated after soybean or weed canopy closure. Weed canopy estimates ranged from 30 to 36% for all weed-infested soybean plots, and weeds present were browntop millet, barnyardgrass, and large crabgrass. In each experiment, data were collected for the green, red, and near-infrared (NIR) spectrums four times after canopy closure. The red and NIR bands were used to develop a normalized difference vegetation index (NDVI) for each plot, and all spectral bands and NDVI were used as classification features to discriminate between weed-infested and weed-free soybean. Spectral response for all bands and NDVI were often higher in weed-infested soybean than in weed-free soybean. Weed infestations were discriminated from weed-free soybean with at least 90% accuracy. Discriminant analysis models formed from one image were 78 to 90% accurate in discriminating weed infestations for other images obtained from the same and other experiments. Multispectral imagery has the potential for discriminating late-season weed infestations across a range of crop growth stages by using discriminant models developed from other imagery data sets.

Nomenclature: Barnyardgrass, Echinochloa crus-galli (L.) Beauv. #3 ECHCG; browntop millet, Brachiaria ramosa (L.) Stapf # PANRA; large crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSA; soybean, Glycine max (L.) Merr.

Additional index words: Discriminant analysis, multispectral, remote sensing, normalized difference vegetation index, weed detection.

Abbreviations: DGPS, differential global positioning system; exp., experiment; NDVI, normalized difference vegetation index; NIR, near infrared; POST, postemergence; PRE, preemergence.

CLIFFORD H. KOGER, DAVID R. SHAW, CLARENCE E. WATSON, and KRISHNA N. REDDY "Detecting Late-Season Weed Infestations in Soybean (Glycine max)," Weed Technology 17(4), 696-704, (1 October 2003). https://doi.org/10.1614/WT02-122
Published: 1 October 2003
JOURNAL ARTICLE
9 PAGES


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