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An Instrument for Measuring Crop Density by Light Absorbance

A. GOLDSWORTHY
Annals of Botany
Vol. 42, No. 182 (November 1978), pp. 1315-1325
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/42756565
Page Count: 11
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An Instrument for Measuring Crop Density by Light Absorbance
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Abstract

A portable instrument is described which measures simultaneously the light intensity above and below a leaf canopy, calculates the absorbance (extinction) and displays it continuously on a meter. It measures the capacity of the crop to absorb light and so provides an estimate of its density and, by inference, the approximate photosynthetic potential. The measurements, which are simple and non-destructive, have been shown to correlate with seed-rate, sowing date, seed-vigour and final yield in wheat. Although originally designed for cereals, the instrument may also find application with other crops.

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