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

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Table III

Plant growth parameters on P. halepensis seedlings inoculated with three ectomycorrhizal fungi under different N fertilization sources (ammonium nitrate-NH₄NO_3,ammonium-(NH₄)₂SO₄, nitrate-HNO₃). For each inoculation treatment, different minor letters indicate significant differences among fertilizations; For each N source, 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
	source	(cm)	(mm)	(No.)	(g)	(g)
P. tinctorius 3SR
	NH₄NO₃	11.8 ± 1.7 b A	3.0 ± 0.1 a A	8.9 ± 0.9 b B	2.2 ± 0.5 a A	1.9 ± 0.5 a A	1.1 ± 0.2 a A
	(NH₄)₂SO₄	15.5 ± 1.3 a A	3.0 ± 0.2 a A	11.2 ± 1.0 a A	2.2 ± 0.6 a A	2.1 ± 0.9 a A	1.1 ± 0.2 a A
	HNO₃	13.8 ± 1.6 b A	2.8 ± 0.2 b A	9.7 ± 1.1 b A	1.9 ± 0.5 a A	1.8 ± 0.5 a B	1.1 ± 0.3 a A
L. deliciosus
	NH₄NO₃	13.2 ± 1.9 a A	3.1 ± 0.5 a A	10.3 ± 1.0 a A	2.2 ± 0.9 a A	1.8 ± 0.7 a A	1.3 ± 0.4 a A
	(NH₄)₂SO₄	13.8 ± 1.8 a B	2.9 ± 0.7 a A	10.1 ± 0.9 a A	2.0 ± 0.4 a B	1.8 ± 0.3 a B	1.1 ± 0.5 a A
	HNO₃	12.7 ± 1.5 a A	2.9 ± 0.3 a A	10.1 ± 0.8 a A	1.8 ± 0.6 a A	1.7 ± 0.3 a B	1.1 ± 0.3 a A
Uninoculated
	NH₄NO₃	11.6 ± 1.3 b A	3.0 ± 0.3 a A	8.3 ± 0.8 b B	1.9 ± 0.7 b B	1.8 ± 0.4 b A	1.1 ± 0.3 a A
	(NH₄)₂SO₄	16.6 ± 2.1 a A	3.1 ± 0.4 a A	11.1 ± 1.1 a A	2.4 ± 0.9 a A	2.2 ± 0.2 a A	1.2 ± 0.2 a A
	HNO₃	15.0 ± 1.9 a B	3.0 ± 0.1 a A	10.0 ± 0.9 ab A	2.1 ± 0.3 b A	2.0 ± 0.5 b A	1.1 ± 0.4 a A
ANOVA significance^∗
Inoculation		ns	ns	ns	ns	^∗∗	ns
N source fertilization		^∗∗	^∗∗	^∗∗	ns	^∗∗	ns
I × F		^∗∗	ns	ns	^∗∗	ns	ns

^∗

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

^∗∗

significant at p < 0.05;

ns: non-significant.