Abstract
E. J. MACHIN1 appears to be unaware of the extensive study by G. E. Blackman2 on the relation between plant density and percentage absence. In a theoretical appendix to this paper, I have pointed out that the most efficient size of quadrat corresponds to about 20 per cent absence, or a product of quadrat size and plant density of about 1·6 (the efficiency remains reasonable over a range of, say, 0·7–3·0, compared with the rather wider range 0·3–3·3 implied by Machin).
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References
Nature, 162, 257 (1948).
Ann. Bot., 49, 749 (1935).
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BARTLETT, M. Determination of Plant Densities. Nature 162, 621 (1948). https://doi.org/10.1038/162621a0
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DOI: https://doi.org/10.1038/162621a0
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