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Mean (+SEM) shoot biomass of Vaccinium vitis-idaea and Deschampsia cespitosa in response to zero additions of P (background P) and addition of sodium phosphate (SP), D-glucose 6 phosphate (DG6P), phytic acid sodium salt (PASS), and a mixture of SP, DG6P, and PASS (Mix measured). Mix (predicted) is the mean biomass from the three single P form treatments. Bars sharing a letter are not significantly different (P > 0.05).
