Mycorrhization, growth and nutrition of Pinus halepensis seedlings fertilized with different doses and sources of nitrogen

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Table I

Plant growth parameters on P. halepensis seedlings inoculated with three ectomycorrhizal fungi under different N fertilization levels (low-LN: 35 mg/plant, medium-MN: 60 mg/plant, high-HN: 120 mg/plant). For each inoculation treatment, different minor letters indicate significant differences among fertilizations. For each N level, different capital letters indicate significant differences among inoculation treatments (Duncan’s test, p ≤ 0.05).

Inoculation	N	Height	Diameter	Branches	Shoot dry weight	Root dry weight	Sdw/Rdw
	dose	(cm)	(mm)	(No.)	(g)	(g)
P. tinctorius 3SR
	LN	9.8 ± 0.9 a A	2.5 ± 0.1 a A	8.7 ± 0.6 a A	1.4 ± 0.2 a A	1.1 ± 0.2 a A	1.2 ± 0.2 a A
	MN	7.9 ± 0.8 b A	2.3 ± 0.1 b A	6.8 ± 0.7 b A	1.3 ± 0.2 b B	1.1 ± 0.3 a A	1.2 ± 0.3 b A
	HN	8.3 ± 0.9 b AB	2.4 ± 0.0 ab AB	7.1 ± 0.7 b AB	1.3 ± 0.3 b A	1.2 ± 0.3 a A	1.1 ± 0.3 b B
P. tinctorius Mx
	LN	9.4 ± 1.1 a A	2.3 ± 0.0 a B	8.1 ± 0.9 ab AB	1.3 ± 0.2 b A	1.0 ± 0.4 a AB	1.3 ± 0.4 a A
	MN	8.2 ± 1.5 a A	2.3 ± 0.0 a A	6.9 ± 0.8 b A	1.2 ± 0.2 b B	1.0 ± 0.2 a A	1.2 ± 0.3 a A
	HN	9.3 ± 0.9 a A	2.4 ± 0.1 a A	8.9 ± 0.7 a A	1.6 ± 0.3 a B	1.2 ± 0.2 a A	1.4 ± 0.4 a A
L. deliciosus
	LN	7.9 ± 1.2 a B	2.3 ± 0.0 a B	6.4 ± 0.9 a C	1.2 ± 0.2 b A	0.9 ± 0.1 b B	1.3 ± 0.1 b A
	MN	7.9 ± 1.3 a A	2.4 ± 0.0 a A	7.5 ± 1.1 a A	1.5 ± 0.2 a A	1.1 ± 0.2 a A	1.4 ± 0.2 ab A
	HN	7.6 ± 1.1 a B	2.2 ± 0.0 a B	6.8 ± 0.8 a B	1.3 ± 0.1 b A	0.9 ± 0.1 b B	1.5 ± 0.1 a AB
Uninoculated
	LN	8.6 ± 1.3 a B	2.3 ± 0.0 a B	7.0 ± 0.7 a B	1.2 ± 0.2 b A	1.0 ± 0.2 a AB	1.3 ± 0.2 a A
	MN	8.0 ± 1.9 a A	2.4 ± 0.0 a A	6.7 ± 0.8 a A	1.4 ± 0.3 ab AB	1.1 ± 0.2 a A	1.3 ± 0.2 a A
	HN	8.2 ± 1.7 a AB	2.4 ± 0.0 a AB	7.1 ± 0.9 a B	1.5 ± 0.2 a B	1.1 ± 0.1 a AB	1.4 ± 0.2 a AB
ANOVA significance
Inoculation			ns	^∗∗	^∗∗	^∗∗	^∗∗
N dose fertilization		^∗∗	ns	^∗∗	^∗∗	ns	^∗∗
I × F		^∗∗	^∗∗	^∗∗	^∗∗	^∗∗	^∗∗

^∗

Summary of the ANOVA of the effects of inoculation (I), N dose fertilization (F) and their interactions;

^∗∗

significant at p < 0.05;

ns: non-significant.