Table 1.

Analyses of variance (ANOVA) of relative concentrations of Ca and Mg, according to four treatment levels, four cell types and two leaf zones, with ten observations per experimental unit

			Calcium			Magnesium
Source of variation	n	d.f.	Sum of squares	P	L.s.d.P = 0.05	Sum of squares	P	L.s.d.P = 0.05
Treatment	240	3	165.3	<0.001	0.140	40.8	<0.001	0.052
Cell type	240	3	119.3	<0.001	0.140	20.0	<0.001	0.052
Leaf zone	480	1	0.3	0.455	0.099	3.1	<0.001	0.037
Treatment/cell type	60	9	119.2	<0.001	0.280	22.3	<0.001	0.103
Treatment/leaf zone	120	3	1.9	0.368	0.198	5.0	<0.001	0.073
Cell type/leaf zone	120	3	1.1	0.596	0.198	3.9	<0.001	0.073
Treatment/cell type/leaf zone	30	9	4.6	0.571	0.395	2.7	<0.001	0.146
	Residual	928	564.9			77.1
	Total	959	976.8			174.8

Least significant differences (l.s.d._{P = 0.05}) between means are indicated.