Table 4.

Maximum, minimum, mean values and coefficient of variation observed for the ten variables studied

	Processes	Variable	Mean observed values	Maximum observed values	Minimum observed values	CV* (no units)
Whole-plant	Biomass accumulation	Increase in whole-plant biomass (mg Cd−1)	172	587·2	−42·1	1·18
		Increase in ‘reserve’ biomass (mg Cd−1)	42·7	144·2	−28·2	1·42
Primary axis	Organogenesis	Phytomer appearance rate (phytomer Cd−1)	0·036	0·047	0·017	0·23
	Morphogenesis	Internode length (cm)	5·1	9·1	0·8	0·63
		Individual leaf area (cm2)	96·2	141·2	12·3	0·52
	Biomass growth	Internode linear weight (mg cm−1)	52·8	136·7	1·6	0·86
		Area leaf weight (mg cm−2)	3·9	6·3	0·3	0·69
Secondary axis	Organogenesis	Phytomer appearance rate (phytomer Cd−1)	0·01	0·021	0·001	0·61
	Morphogenesis	Internode length (cm)	1·4	2·5	0·5	0·51
	Biomass growth	Internode linear weight (mg cm−1)	10·9	25·9	3·4	0·78

* The coefficient of variation for each variable was calculated as the ratio of the observed s.d. to the observed mean value for the whole dataset.

Data were collected in expts 1–5.