A batch experiment was conducted to investigate the property of nutrient removal(N,P),plant growth(Oenanthe javanica)and the correlation under different ratios of nitrate to ammonium m(NO_3~--N)/m(NH_4~+-N).The results showed that,the maximum TN removal efficiency was 23.87%as the ratio of nitrate to ammonium was 3:1,while the highest removal efficiency of TP was 15.89%at 1:1.The highest stem height was 28.6 cm as the ratio of nitrate to ammonium was 9:1,and the longest root length was 10.2 cm at 1:1.A sign...