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Table 1 Analysis of variance of the N sources, N concentrations and species.

From: Depletion of the heaviest stable N isotope is associated with NH4+/NH3 toxicity in NH4+-fed plants

Global Effect δ 15N
(‰) 		Total Biomass
(g DW)
Factor F P > F F P > F
N Source 1273.54 < 0.0001 8.62 0.0043
N Source × N Conc. 19.95 < 0.0001 16.01 < 0.0001
N Source × sp. 10.01 < 0.0001 39.71 < 0.0001
N Source × N Conc. × sp. 1.23 0.2701 7.46 < 0.0001
Whole model R2 0.956 0.939
  1. Global effects of N sources and interaction terms, including the N source effects, on isotopic composition (‰) and total biomass (g DW). N Conc.: N concentration; sp.: species. The main effects of the N concentration and species are not included because the results of the ANOVA test were masked by the strong N source effect. They are shown separately by the N source in Table 2. Significant effects (P ≤ 0.05) are shown in bold.
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