The phosphorus concentration in the water was low in the mixed planting pattern, compared with either of the
two monocultures ( Figures.1-3). For TP concentration in water, the average value was 0.12 mg l-1 in the mixture
and 0.17 mg l-1 and 0.16 mg l-1 in the two monocultures of V. natans and H. verticillata, respectively (Figure 1).
No significant differences were observed for TSP (Figure 2) or SRP (Figure 3) concentrations in the water between
mixed and monocultures (p>0.05). The SRP concentrations were particularly low (Figure 3); the SRP: TP ratio was
only about 3%.