The contrast of humic acid and citric acid on phosphorus P release from the different synthesized phosphates

The influence of organic acids,humic acid and citric acid,on phosphorus release from synthesized phosphates was studied with chemical extraction.The main results were as follows: the two organic acids,humic acid and citric acid,improved phosphorus release from different synthesized phosphate compounds(DCP,OCP,FA,Fe-P,Al-P);The mobilization of phosphorus by organic acids varied with the types,concentrations and the solid-liquid proportion of organic acids and the solubility of phosphates.The extent of mobilizing increased with increment of organic acid concentration for the same organic acid;and the extent of mobilizing were not discipline with the change of the solid-liquid proportion;in the same condition(in a short time),the ability of citric acid in mobilizing phosphorus from synthetic phosphate was stronger than humic acid.