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Midday leaf gd, Ed, A/g and A/E as a function of root-zone temperature 48 d after the onset of treatments. Soil moisture was not different between the treatments (F-test, P = 0·72) and averaged 22·6 ± 1·4 % at the time of measurement. F-test of linear regression for g = 0·001, E = 0·001, A/g = 0·001 and A/E = 0·001; variance accounted for in g = 0·47, E = 0·49, A/g = 0·34 and A/E = 0·19.
