Table 2.

Macronutrient leaf and stem concentrations (mean ± SE; the same letters within the same tissue and element correspond to Tukey’s HSD 95% homogeneous groups).

			[Macronutrients] (g kg-1 DW)
Tissue	Species	Treatment	N	P	K	Ca	Mg
Leaf	U. laevis	0 μM Fe	25.8 ± 0.5 a	9.3 ± 0.2 f	16.8 ± 0.3 ab	53.0 ± 1.1 d	10.4 ± 0.2 e
		1 μM Fe	30.7 ± 0.3 bc	6.0 ± 0.2 e	17.5 ± 1.1 ab	38.4 ± 1.7 cd	6.8 ± 0.2 d
		5 μM Fe	32.1 ± 3.4 bc	2.6 ± 0.1 ab	14.0 ± 0.7 a	32.2 ± 2.0 abc	5.0 ± 0.3 c
		20 μM Fe	40.1 ± 0.4 c	2.4 ± 0.1 ab	15.9 ± 0.7 ab	25.2 ± 1.2 a	3.5 ± 0.2 a
	U. minor	0 μM Fe	35.3 ± 0.7 bc	5.2 ± 0.1 de	15.0 ± 0.3 a	40.0 ± 0.8 cd	5.6 ± 0.1 cd
		1 μM Fe	34.3 ± 1.6 bc	4.1 ± 0.5 cd	17.2 ± 1.5 ab	36.8 ± 1.0 bc	6.5 ± 0.1 d
		5 μM Fe	37.4 ± 1.0 bc	2.4 ± 0.1 a	15.9 ± 1.2 ab	32.6 ± 1.9 bc	4.6 ± 0.2 bc
		20 μM Fe	39.7 ± 0.9 c	3.2 ± 0.2 bc	19.3 ± 1.1 b	27.9 ± 1.5 ab	3.6 ± 0.3 ab
Stem	U. laevis	0 μM Fe	32.5 ± 0.6 b	4.7 ± 0.1 d	9.6 ± 0.2 a	20.1 ± 0.4 c	2.0 ± 0.0 bc
		1 μM Fe	18.0 ± 0.4 a	3.6 ± 0.1 cd	12.4 ± 0.2 ab	14.1 ± 0.3 bc	1.3 ± 0.0 abc
		5 μM Fe	19.5 ± 2.8 a	1.6 ± 0.1 ab	12.5 ± 0.9 ab	8.9 ± 0.7 ab	1.1 ± 0.1 ab
		20 μM Fe	16.6 ± 1.0 a	1.4 ± 0.1 a	11.9 ± 0.8 ab	7.0 ± 0.6 a	0.9 ± 0.1 a
	U. minor	0 μM Fe	29.1 ± 0.6 b	3.3 ± 0.1 c	12.5 ± 0.3 a	13.0 ± 0.3 bc	2.4 ± 0.0 c
		1 μM Fe	27.4 ± 0.5 b	4.2 ± 0.1 cd	24.0 ± 0.5 c	15.0 ± 0.3 c	4.0 ± 0.1 d
		5 μM Fe	17.2 ± 1.2 a	1.5 ± 0.1 ab	14.7 ± 0.9 ab	7.3 ± 0.6 a	1.7 ± 0.1 c
		20 μM Fe	19.4 ± 1.5 a	2.0 ± 0.1 a	17.7 ± 1.5 cd	7.4 ± 0.3 a	1.5 ± 0.1 bc