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Short Note: An Instrument for Measuring the Transmission of Short Wave Radiation by Crop Canopies
B. A. Williams and R. B. Austin
Journal of Applied Ecology
Vol. 14, No. 3 (Dec., 1977), pp. 987-991
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/2402827
Page Count: 5
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(1) A new instrument is described for measuring the percentage transmission of photosynthetically active radiation within crop canopies. (2) The instrument is portable, easy to use and gives an immediate digital display of percentage transmission. (3) Percentage transmission measured with the instrument was similar to that determined with tube solarimeters. (4) Full details of the circuits are available from the authors.
Journal of Applied Ecology © 1977 British Ecological Society