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Fig. 4. Chlorophyll meter readings (SPAD units, optical density difference at two wavelengths: 650 mm and 940 mm) (A), and leaf tissue P (B) and N (C) concentrations, and leaf biomass (D) in mycorrhizal (+M) and non‐mycorrhizal (–M) willows with (+B) and without (–B) organic nutrient patch addition. Bars = 95 % LSD.
