Moreover, it was shown that phosphorus content in every organ of water spinach almost increased as time elapsed, which indicated that water spinach could assimilate large amounts of phosphorus from water body, consistence with the water quality monitored in present study. Phosphorus content in root of water spinach was higher than that of stem and leaf with the average value of 2.9 g/kg. The average phosphorus content in stem and leaf was 2.2 g/kg and1.4 g/kg, respectively. However, the average phosphorus assimilation rate was highest in the stem of water spinach.