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Table IV

Nutrient concentration in needles of P. halepensis seedlings inoculated with three ectomycorrhizal fungi under different N fertilisation sources (ammonium nitrate-NH4NO3,ammonium-(NH4)2SO4, nitrate-HNO3). For each inoculation treatment, different letters indicate significant differences (Duncan’s test, p ≤ 0.05).

Inoculation N N P K
source (%) (%) (%)
P. tinctorius 3SR
NH4NO3 1.00 ± 0.04 a 0.20 ± 0.03 a 1.07 ± 0.08 a
(NH4)2SO4 0.90 ± 0.03 a 0.18 ± 0.02 a 0.96 ± 0.04 a
HNO3 0.96 ± 0.03 a 0.24 ± 0.01 a 1.21 ± 0.08 a
L. deliciosus
NH4NO3 0.96 ± 0.02 a 0.22 ± 0.01 a 1.14 ± 0.03 a
(NH4)2SO4 0.95 ± 0.05 a 0.22 ± 0.01 a 0.86 ± 0.05 b
HNO3 0.91 ± 0.10 a 0.21 ± 0.03 a 0.88 ± 0.07 b
Uninoculated
NH4NO3 0.78 ± 0.04 a 0.19 ± 0.05 a 1.09 ± 0.07 a
(NH4)2SO4 0.89 ± 0.02 a 0.18 ± 0.03 a 0.84 ± 0.02 b
HNO3 0.93 ± 0.03 a 0.2 ± 0.03 a 0.9 ± 0.05 ab
ANOVA significance
Inoculation ns ns ∗∗
N source fertilization ns ns ∗∗
I × F 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.