Figure 6
Nitrogen and P contents in the sediments (a) and plant tissues (b) before and after the trial at different NH4Cl concentrations (C0: initial value; C1: 3 mg/L; C2: 5 mg/L; C3: 7 mg/L; C4: 10 mg/L; C5: 15 mg/L). Initial total phosphorus concentration was 1.0 mg/L. Bars sharing the same letters are not significantly different at P = 0.05. Values are mean ± SD (n = 3).
