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. 2005 Mar 24;95(7):1211–1220. doi: 10.1093/aob/mci133

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© The Author 2005. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

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Fig. 1. — Relationships between net assimilation rate and area-based leaf nitrogen concentration for Polygonum cuspidatum (A) and Chenopodium album (B). Each point is the mean for each of the five nitrogen treatments. Data were fitted to a rectangular hyperbolic function individually for a harvest. Because the data of P. cuspidatum at 0·2 mm N was missed and reliable regression could not be done for day 12, the equation of day 27 was used for day 20. Filled circles, day 12; open circles, day 27; filled triangles, day 42, open triangles, day 57. Polygonum cuspidatum: y = 9·09(x − 0·41)/(0·17 + x − 0·41) (r = 0·75), day 12, 27; y = 9·14(x − 0·41)/(0·34 + x − 0·41) (r = 0·92), day 42; y = 6·59(x − 0·41)/(0·17 + x − 0·41) (r = 0·62), day 55. C. album: y = 15·0(x − 0·41)/(0·28 + x − 0·41) (r = 0·92), day 12; y = 11·7(x − 0·39) (0·34 + x − 0·39) (r = 0·99), day 27; y = 9·72 (x − 0·44)/(0·40 + x − 0·44) (r = 0·81), day 42; y = 6·87(x − 0·37)/(0·23 + x − 0·37) (r = 0·91).