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Effect of two fertilization treatments (high [F+] and low [F-]) on (A) relative growth rate (RGR), (B) leaf area productivity (LAP), (C) leaf N productivity (LNP) and (D) leaf N content (LN/LA) on two Salix genotypes ‘Loden’ (gray) and ‘Tora’ (white) grown in mixture (mix) and monoculture (mono). Values represent mean ± SE (n = 8).
