Table 1.

Mean (M) concentration and standard error (SE) (mg/kg dw) of major, minor, trace, and rare-earth elements measured in elephant garlic bulbs cultivated organically and conventionally in Valdichiana. * = statistically significant (p < 0.05) difference.

	Organic		Conventional
	M	SE	M	SE
Major essential elements
K	13627	663	13100	591
S	9691	691	11008	378
P	2970	171	2780	128
Mg	905	16	972	34
Ca	585	48	548	40
Minor and trace essential elements
Na	68	6	97	18
Fe	50	2	52	2
Zn	24.4	2.9	23.5	2.4
Mn *	7.5	0.3	11.6	0.5
Cu	4.0	0.4	4.6	0.4
Ni	3.4	0.9	3.9	0.5
V	0.08	0.01	0.06	0.01
Co *	0.024	0.002	0.051	0.004
Trace non-essential elements
Sr	10.0	0.8	8.1	0.3
Ba	1.8	0.2	1.6	0.1
Rb *	1.5	0.2	4.2	0.5
Pb	0.26	0.01	0.28	0.02
Cr	0.13	0.04	0.21	0.04
U	0.070	0.003	0.074	0.003
Cd *	0.005	0.001	0.136	0.028
Sb *	0.005	0.001	0.014	0.005
As	<0.001	-----	<0.001	-----
Tl	<0.001	-----	<0.001	-----
Rare-earth elements
Ce	0.033	0.004	0.026	0.002
La	0.012	0.001	0.013	0.002
Nd	0.007	0.001	0.007	0.001
Pr	0.002	0.001	0.002	0.001
Sm	0.002	0.001	0.002	0.001
Eu	<0.001	-----	<0.001	-----
Gd	<0.001	-----	<0.001	-----
Tb	<0.001	-----	<0.001	-----
Dy	<0.001	-----	<0.001	-----
Ho	<0.001	-----	<0.001	-----
Er	<0.001	-----	<0.001	-----
Tm	<0.001	-----	<0.001	-----
Yb	<0.001	-----	<0.001	-----
Lu	<0.001	-----	<0.001	-----