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The study investigated biomass yield and the uptake of P and aluminum by switchgrass grown in a low-P soil amended with alum-P sludge and a conventional fertilizer, monoammonium phosphate (MAP), at rates of 9.7, 19.4, 29.1 and 38.8 mg P kg-1 dry soil. Potted soil (amended and control) units were seeded with pre-germinated switchgrass and harvested three times at 50-day intervals. Over the three growth cycles, P from alum-P sludge gradually became available. Amendment rate showed no significant effect on switchgrass biomass yield. P ava