Abstract
SOME years ago, Heath and Gregory1 made the generalization that the mean net assimilation-rate was constant for species and environments. Subsequent work has demonstrated some large departures from their mean value of about 0.55 g/dm2/week, although Watson2 has more recently supported the validity of their general conclusion that leaf growth is the main yield determinant. Most of these studies have been made on annual crop plants and very few estimates are available for mean net assimilation-rates of perennials.
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References
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REES, A. Dry-Matter Production by Evergreen Perennials. Nature 195, 1118–1119 (1962). https://doi.org/10.1038/1951118a0
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DOI: https://doi.org/10.1038/1951118a0
