A weighted mean leaf-sun angle is defined as the ratio of the projection of sunlit leaf area on a plane normal to the solar beam to total sunlit leaf area. The former area may be measured photographically, the latter by application of a photosensitive chemical. The accuracy of the technique was assessed by numerical analysis over a range of leaf-sun angles, light flux densities and degrees of light saturation of photosynthesis. The maximum error was shown to be of order 16% which is considered acceptable in view of the simplicity of the technique. © 1973.
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