A Method of Calculating Net Assimilation Rate

descriptionPublicationkeyboard_double_arrow_right Article 23 Nov 1963 United Kingdom English Publisher:Springer Science and Business Media LLCJournal:Nature, volume 200, pages 814-814 (issn: 0028-0836, eissn: 1476-4687,

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Authors: Vernon, A. J.; Allison, J. C. S.;

doi: 10.1038/200814a0

A Method of Calculating Net Assimilation Rate

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Abstract

A USEFUL measure of the photosynthetic efficiency of plants is ‘net assimilation rate’ (E) defined by Gregory1 as the rate of increase of dry weight (W) per unit of leaf area (L); that is: In measuring W the plant is destroyed, so changes in W can be determined only by successive sampling from a population of plants, involving sampling errors. In practice samples are commonly taken at intervals of 1–4 weeks for measuring both W and L. The paired W and L sample means may then be used to calculate EM, an estimate of the mean E for each time-interval (t2–t1), usually as proposed by Gregory2:

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United Kingdom

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Rothamsted Research
United Kingdom
Rhodes University
South Africa

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