TABLE 1.

Mycorrhizal colonization at the beginning of the season, 3 months post-treatment application, and at harvest and relative mycorrhizal dependency (RMD) for vegetative growth of Merlot/3309C grapevines subjected to different irrigation amount (FI, Full Irrigated; HI, Half Irrigated), AMF inoculation (I, inoculated; NI, non-inoculated), and their combinations.

	Mycorrhizal colonization (%)			RMD (%)
	Native	After 3 months	Harvest
Treatments
FINI	1.68 ± 1.04	4.19 ± 1.16 b	14.14 ± 4 ab	78.43 ± 10.64 b
FII	1.11 ± 0.45	21.16 ± 2.66 a	26.28 ± 3.47 a
HINI	2.21 ± 0.67	7.91 ± 0.76 b	9.23 ± 1.99 b	116.52 ± 8.54 a
HII	2.78 ± 0.67	16.38 ± 5.17 a	24.09 ± 4.02 a
LMEM
Irrigation (I)	*	ns	ns	*
Mycorrhizal inoculation (M)	ns	**	**
I × M	ns	ns	ns

Grapevines were measured in Oakville (California) during the 2020 growing season. Values represent means ± SE (n = 4) separated by Kenward–Roger method and Tukey’s p-value adjustment (P ≤ 0.05). Different letters within column, indicate significant differences as affected by Irrigation amount, I, AMF inoculation, M, and their interaction (I × M). ns, * and ** indicate non-significance or significance at 5%, and 1% probability levels, respectively. LMEM, linear mixed-effect model.