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| DOI: | 10.1111/j.1365-3180.1984.tb00571.x |
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| Web URL(s): | http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3180.1984.tb00571.x/epdf
Last checked: 10/31/2017
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Haggar, R. J.;
Stent, C. J.;
Rose, J. |
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| Author Affiliation: | Agricultural Research Council, Weed Research Organization, Yarnton, Oxford |
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| Title: | Measuring spectral differences in vegetation canopies by a reflectance ratio meter |
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| Source: | Weed Research. Vol. 24, No. 1, February 1984, p. 59-65. |
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| Publishing Information: | Oxford, United Kingdom: Blackwell Scientific Publications |
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| # of Pages: | 7 |
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| Related Web URL: | http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3180.1984.tb00571.x/full
Last checked: 10/31/2017
Notes: Abstract only |
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| Keywords: | TIC Keywords: Canopy; Equipment evaluation; Reflectance ratio meter; Remote sensing; Spectral analysis; Spectral reflectance
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| Abstract/Contents: | "A simple, robust and inexpensive hand-held meter is described which senses the presence of green vegetation against brown soil by measuring the ratio of near infra-red (0·75 μm) to red (0·65 μm) radiances: ratios are higher for green canopies than for soil, due to strong absorption by chlorophyll of red wavelength and the high near-infrared reflectance of healthy vegetation. Field tests showed that radiance data were correlated closely with plant density and growth stage. Such spectral assessments provide a rapid, nondestructive method of monitoring changes in green-leaf biomass. Although only small differences in radiance values were recorded from monocultures of various non-flowering species there was a positive correlation with content of white clover in five grass/clover swards. In addition to being a research aid, these findings confirm the potential of remote sensing of agricultural targets, e.g. detection of weed patches for herbicide spraying, or gaps in swards for sowing seed." |
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| Language: | English |
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| References: | 10 |
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| Note: | Abstract also appears in French and German
Summary appears as abstract
Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Haggar, R. J., C. J. Stent, and J. Rose. 1984. Measuring spectral differences in vegetation canopies by a reflectance ratio meter. Weed Res. 24(1):p. 59-65. |
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| DOI: 10.1111/j.1365-3180.1984.tb00571.x |
| Web URL(s):
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-3180.1984.tb00571.x/epdf
Last checked: 10/31/2017
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: b2221093 |
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