When four aquatic macrophytes were supplied with different inorganic nitrogen treatments: NH4 þ and
NO3 each alone and together, the NH4 þ uptake rate was still significantly higher than the NO3 uptake rate found that a macrophyte Eichhornia crassipes under 12 h d1 PP removed from water 7.4% more TN and 4.1% more NH4þ than under 10 h d1 PP.