Table 4 Interaction effect of cultivation systems and different N sources on the concentration of micronutrients in licorice.

Cultivation system	N sources	Fe (mg.Kg^− 1 DM)		Mn (mg.Kg^− 1 DM)		Zn (mg.Kg^− 1 DM)		Cu (mg.Kg^− 1 DM)
Cultivation system	N sources	Root	Shoot	Root	Shoot	Root	Shoot	Root	Shoot
Aeroponic	NO₃	^c 145	^b 162	^c 95	^b 85	^b 68	^ab 52	^a 20	^a 14
	NH₄NO₃	^a 167	^a 172	^a 112	^a 90	^a 75	^a 55	^a 21	^a 15
	NH₄	^c 120	^d 130	^e 76	^c 80	^e 45	^c 40	^a 18	^a 14
NFT	NO₃	^cd 140	^c 151	^c 92	^bc 82	^b 66	^ab 52	^a 22	^a 16
	NH₄NO₃	^b 157	^b 163	^a 113	^a 92	^a 73	^ab 53	^a 21	^a 15
	NH₄	^d 125	^d 136	^d 85	^cd 78	^e 48	^c 42	^a 18	^a 14
Inert substrate	NO₃	^d 126	^cd 145	^c 92	^d 75	^bc 64	^a 55	^a 20	^a 14
	NH₄NO₃	^c 145	^c 150	^b 105	^b 83	^b 66	^ab 53	^a 21	^a 15
	NH₄	^ef 115	^ef 120	^d 80	^d 72	^d 52	^b 47	^a 18	^a 14
Soil	NO₃	^f 113	^f 118	^e 73	^d 71	^e 48	^c 40	^a 18	^a 14
	NH₄NO₃	^d 125	^d 130	^d 83	^d 75	^d 56	^bc 45	^a 19	^a 13
	NH₄	^f 114	^e 125	^d 80	^d 72	^d 54	^bc 44	^a 18	^a 15

Means sharing a common letter are not significantly different by Duncan’s multiple range test at p ≤ 0.05. Values are means of three replications.
Zinc in roots and shoot.

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