Table 2 Summary of reduced major axis (RMA) regression results among leaves, stems, roots for each element.

	Nutrient	RS	95%CI	R²	P	n
Leaves vs. stems	N	2.08	1.90–2.28	0.58	<0.0001	194
	P	1.37	1.26–1.49	0.67	<0.0001	194
	K	2.00	1.77–2.27	0.26	<0.0001	194
	Na	3.37	3.02–3.75	0.42	<0.0001	194
	Ca	3.00	2.64–3.40	0.19	<0.0001	194
	Mg	3.34	2.94–3.79	0.19	<0.0001	194
	Mn	1.22	1.14–1.30	0.78	<0.0001	194
	Zn	1.13	1.06–1.20	0.80	<0.0001	194
	Cu	1.86	1.70–2.04	0.59	<0.0001	194
	Fe	1.00	0.90–1.10	0.53	<0.0001	194
Leaves vs. roots	N	2.05	1.87–2.25	0.57	<0.0001	194
	P	1.72	1.55–1.90	0.51	<0.0001	194
	K	2.74	2.46–3.06	0.39	<0.0001	194
	Na	10.48	9.28–11.9	0.26	<0.0001	194
	Ca	2.45	2.19–2.74	0.36	<0.0001	194
	Mg	4.66	4.08–5.31	0.14	<0.0001	194
	Mn	1.58	1.46–1.72	0.67	<0.0001	194
	Zn	2.10	1.94–2.27	0.69	<0.0001	194
	Cu	1.78	1.60–1.99	0.40	<0.0001	194
	Fe	1.45	1.27–1.65	0.18	<0.0001	194
Stems vs. roots	N	0.97	0.89–1.06	0.62	<0.0001	194
	P	1.26	1.15–1.37	0.61	<0.0001	194
	K	1.37	1.20–1.56	0.11	<0.0001	194
	Na	3.11	2.78–3.50	0.33	<0.0001	194
	Ca	0.81	0.77–0.87	0.83	<0.0001	194
	Mg	1.40	1.25–1.56	0.38	<0.0001	194
	Mn	1.30	1.18–1.43	0.55	<0.0001	194
	Zn	1.86	1.73–2.02	0.70	<0.0001	194
	Cu	0.96	0.90–1.02	0.79	<0.0001	194
	Fe	1.45	1.30–1.63	0.35	<0.0001	194

Regression slope (RS) estimates in bold are significantly different from 1, indicating the allometric relationships of leaf versus root for the related nutrient. CI, confidence interval; n, sample size.

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