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Optical Parameters of Leaves of Seven Weed Species

Published online by Cambridge University Press:  12 June 2017

H. W. Gausman ,
R. M. Menges ,
A. J. Richardson ,
H. Walter ,
R. R. Rodriguez  and
S. Tamez
H. W. Gausman
Affiliation:
Univ. of Hohenheim, West Germany, Sponsored by Deutsche Forschungsgemeinschaft
R. M. Menges
Affiliation:
Univ. of Hohenheim, West Germany, Sponsored by Deutsche Forschungsgemeinschaft
A. J. Richardson
Affiliation:
Univ. of Hohenheim, West Germany, Sponsored by Deutsche Forschungsgemeinschaft
H. Walter
Affiliation:
Univ. of Hohenheim, West Germany, Sponsored by Deutsche Forschungsgemeinschaft
R. R. Rodriguez
Affiliation:
Univ. of Hohenheim, West Germany, Sponsored by Deutsche Forschungsgemeinschaft
S. Tamez
Affiliation:
Sci. Ed. Admin., U.S. Dep. Agric., Weslaco, TX 78596
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Abstract

Absorption coefficient (k), infinite reflectance (Ri), and scattering coefficient (s) were tabulated for five wavelengths and analyzed for statistical differences for seven weed species. The wavelengths were: 0.55 μm, 0.65 μm, 0.85 μm, 1.65 μm, and 2.20 μm. The Ri of common lambsquarters (Chenopodium album L.), johnsongrass [Sorghum halepense (L.) Pers.], and annual sowthistle (Sonchus oleraceus L.) leaves at the 0.85-μm wavelength were significantly (p = 0.05) higher than for sunflower (Helianthus annuus L.), ragweed parthenium (Parthenium hysterophorus L.), or London rocket (Sisymbrium irio L.). Annual sowthistle had the largest k value, and Palmer amaranth (Amaranthus palmeri S. Wats.) had the smallest k value at the 0.65-μm chlorophyll absorption wavelength. In general, johnsongrass, ragweed parthenium, or London rocket had the largest s values among the five wavelengths, whereas annual sowthistle and Palmer amaranth were usually lowest.

Keywords

Absorption coefficientinfinite reflectancescattering coefficient
Type
Research Article
Information
Weed Science , Volume 29 , Issue 1 , January 1981 , pp. 24 - 26
Copyright
Copyright © 1981 by the Weed Science Society of America 

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References

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