Phosphorus mass balance calculations for ‘Rising Sun' Japanese iris, switchgrass, and upright sedge across 5 alkalinity treatments (0, 100, 200, 300 and 400 mg.L−1 CaCO3 using sodium bicarbonate) for two years (2016 and 2017) after 6-week exposure to nutrients in floating treatment wetlands. Values presented are the means (standard error) of the mean.