Annals of Botany 75: 541-544, 1995
© 1995 Annals of Botany Company
The Relationship between the Growth Rate of Young Plants and their Total-N Concentration is Unique and Simple: a Comment
Department of Ecology and Environmental Research, Swedish University of Agriculture Sciences, PO Box 7072, S-750 07 Uppsala, Sweden
A series of experiments with cabbage and lettuce, where nitrogen supply is interrupted at a given and the future development of plants mass and of nitrogen concentration are observed, is re-analysed. Using the nitrogen productivity theory, it is shown that plant properties determined from growth under unlimited nitrogen supply also explain the behaviour under interrupted nitrogen supply. This is in contrast to the suggestion of the original author Burns 1994, Annals of Botany 74: 143-157, who questions the existence of a unique relationship between plant relative growth rate (RGR) and nitrogen concentration. Some serious problems in the models suggested by the author are also indicated.Copyright 1995, 1999 Academic Press
Cabbage, lettuce, model, nitrogen limitation, nitrogen productivity, relative growth rate
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