Optimizing Conditions for determination of Available Phosphorus in calcareous soils by Sodium bicarbonate extrac-tion
A method for determining the content of available phosphorus in calcareous soil using sodium bicarbonate extraction method was established by optimizing the conditions of color development temperature and extraction temperature.Under the optimal experimental conditions,the correlation coefficient of the standard curve was 0.999 4,the relative standard deviation of this method was rates ranged from3.5%～7.8%.The results showed that the method was simple,sensitive and accurate.The optimized method was suitable for rapid determination of available phosphorus in calcareous soil.
Available phosphorusColor temperatureExtraction temperatureCalcareous soil
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