Abstract
Carbon dioxide exchange rates of white clover (Trifolium repens L.) stands were monitored for several days at 30 C, a high light level (2.0 mE.s−1.m−2), and different day/night lengths in the range 6/18 to 18/6 hours. The plants were then kept in continuous darkness for 2 days. Thornley's growth and maintenance coefficients were calculated from the 24 hour CO2 exchange rates. The yield of new biomass carbon (C) per unit of C input into growth (Yg) was found to be independent of daylength, the average value being 0.74 ± 0.01. The maintenance loss rate of C per unit of biomass C present (m), increased from 36 to 53 mg.g−1 24hour−1 as the daylength increased from 6 to 18 hours. This was shown to be an indirect effect of the seven‐fold increase in the growth rate (24 hour net gain) from 12 to 90 g Co2.m−3.24hour−1. No direct effect of daylength on either growth or maintenance requirements was found.
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