Table 7: Some physical-chemical characters of water in Selinda canal before and after eradication of pistia stratiotes.

Nutrients Before control After control
pH units 6.95 7.65
EC, ┬ÁS cm-1 315 143
Dissolved O2 2.1 4.9
NO3-N mg L-1 4.7 0.77
PO4-P mg L-1 2.8 0.16
K mg L-1 7.9 3.7