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The spread of the calibration set in near-infrared reflectance spectroscopy

Published online by Cambridge University Press:  27 March 2009

G. Z. Wetherill  and
I. Murray
G. Z. Wetherill
Affiliation:
Scottish Agricultural Statistics Service, The King's Building, Mayfield Road, Edinburgh EH9 3JZ
I. Murray
Affiliation:
North of Scotland College of Agriculture, 581 King Street, Aberdeen AB9 1UD
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Summary

Frequently in near-infrared reflectance spectroscopy, a calibration is developed using very restricted data sets, e.g. material from one season, a small area or of a limited type: consequently, the predictions may have limited validity. This paper describes the use of both restricted and wide calibration sets for the prediction of crude protein in grass, silage and hay. Results show that predictions from the wider calibration sets are often as good as or better than predictions from restricted calibration sets. Therefore the use of wide calibration sets should be considered much more frequently in near-infrared reflectance.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 109 , Issue 3 , December 1987 , pp. 539 - 544
Copyright
Copyright © Cambridge University Press 1987

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