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The growth of vining peas

III. The effect of shading on abscission of flowers and pods

Published online by Cambridge University Press:  27 March 2009

J. T. Meadley  and
G. M. Milbourn
J. T. Meadley
Affiliation:
Wye College (University of London), Ashford, Kent
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Summary

When incoming radiation was reduced artificially to 50% daylight during the postflowering period in peas, the rate of abscission of flowers and pods increased in the same way as when the density of planting is raised. Shading from flowering onwards reduced yield almost to the level of peas that were shaded throughout the growing season, even though peas that received full daylight until flowering had many fertile tillers and a greater reproductive potential in terms of the total number of flowers produced. Conversely, when shades were removed at flowering time the crop was able to compensate and yields approached those of peas grown entirely in full daylight, this was mainly due to a reduction in absoission losses of flowers and pods so that the majority of pods formed on the main stem contributed to final yield.

It is suggested from these results that the major source of dry matter for pea yield is the photosynthate produced during the post-flowering period rather than that translocated from roots or stems following storage during the vegetative period.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 77 , Issue 1 , August 1971 , pp. 103 - 108
Copyright
Copyright © Cambridge University Press 1971

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