Improved methods of estimating root length using a photocopier,a light box and a bar code reader |
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Authors: | P R Collins P J Gregory H R Rowse A Morgan B Lancashire |
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Institution: | (1) Department of Soil Science, University of Reading, London Road, RE1 5AQ Reading, UK;(2) National Vegetable Research Station, CV35 9EF Wellesbourne Warwick, UK |
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Abstract: | Photocopying was found to be a rapid method of making a permanent record of a root sample. The method used produced a copy
with white roots against a black background.
Manual estimates of root length were made from photocopies using a light box. The number of intersections visible when laid
over a copy of a white on black regular square grid was counted. Automated estimates of root length were made by scanning
a photocopy with a bar code reader in place of a pen in a computer-driven graph plotter. Roots >0.2 mm diameter were resolved
with precision and speed. |
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Keywords: | root length |
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