Abstract

SUMMARYFaba beans were grown under various shading treatments at densities of 20 and 60 plants m‐2. The amount of PAR absorbed by each treatment was estimated from measured leaf area index. The conversion factor (E, g MJ‐1) relating dry matter production to absorbed PAR increased as shading increased. Application or removal of shade changed E rapidly, though there was some evidence for an increased value of ɛ persisting after removal of shade. Differences in dry matter production between the two years were due to as much to differences in ɛ as to changes in the amount of light absorbed. Increased plant density increased PAR absorbed but hardly affected e.

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