The effects of phosphate and potassium fertilizers on water absorbent and nutrients holding ability of water retaining agent(WRA) were studied by determining water absorbent rate and amounts of absorbed and fixed fertilizers by WRA in different phosphate and potassium fertilizers,such as ammonium phosphate,super phosphate,potassium chloride,and potassium sulfate.The results showed that the water absorbent ability of the WRA decreased obviously along with the increase of concentrations of various fertilizers.Phosphate and potassium fertilizers had stronger influence on polyacrylic salt polymer than polyacrylic salt-polyacry lamide polymer.The effects of phosphate and potassium fertilizers on the water absorbent rate were: ammonium phosphate