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Stand structure and light penetration. 4. A sensor for measuring photosynthetically active radiation.

Published online: 01 Jan 1981

Authors: Fitter, D. J. & Knapp, P. H. & Wilson, J. W.

Content type: Journal article

Journal title: Journal of Applied Ecology

The construction and calibration of a sensor for measuring light interception in crop canopies are described.

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Aphid feeding by some polyphagous predators in relation to aphid density in cereal fields.

Published online: 01 Jan 1981

Authors: Sunderland, K. D. & Vickerman, G. P.

Content type: Journal article

Journal title: Journal of Applied Ecology

Samples of aphids and predators were taken from 10 spring barley and winter wheat fields in southern UK between May and September in 1972-77. The guts...

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