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Proceedings Paper

Radiometric Measurements In Studies Of Crop Growth
Author(s): M. D. Steven
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Paper Abstract

Crops that are supplied with adequate water and soil nutrients grow at a rate that is proportional to the intercepted solar radiation. The fraction of solar energy stored in a crop by photosynthesis may be considered as an efficiency, and typical values for various farming systems range from 0.04 to 1.0 %. One factor limiting this efficiency is the ability of the crop to intercept light, which may be measured by a combination of tube solarimeters, or other spatially averaging instruments, above and below the crop canopy. Photosynthesis is sensitive to radiation in the 400-700 nm band, but broader band measure-ments may be used in practice because the spectral distribution of incident solar radiation varies very little with weather conditions. Many plant development processes respond to the spectral quality of light. The ratio of light in the red band (centred on 660 nm) and the far-red band (centred on 730 nm) determines the concentrations of two forms of phytochrome which control plant development. Light quality in crop canopies may have important ecological implications and measurements can be made using a portable spectroradiometer.

Paper Details

Date Published: 18 November 1980
PDF: 5 pages
Proc. SPIE 0234, New Developments and Applications in Optical Radiation Measurement, (18 November 1980); doi: 10.1117/12.958949
Show Author Affiliations
M. D. Steven, University of Nottingham (United Kingdom)


Published in SPIE Proceedings Vol. 0234:
New Developments and Applications in Optical Radiation Measurement
A. J. Allnutt, Editor(s)

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