Fig. 4. Pseudostem DM (a) and root DM between 0 and 10 cm soil depth (b) during regrowth of perennial ryegrass swards from 21 July to 15 Sept. 1997 at ambient (36 Pa) and elevated (60 Pa) pCO₂ and after an infrequent (4 cuts yr^-1) and frequent (8 cuts yr^-1) cutting treatment before the beginning of the experiment (Error bars = SE, n = 6).

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