Calcareous purple soil phosphorus grading method
A grading method and calcareous technology, applied in thermal excitation analysis, material excitation analysis, etc., can solve problems such as the study of limiting phosphorus cycle, and achieve the effect of ensuring scientificity and accuracy
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[0020] The method for grading calcareous purple soil phosphorus in the present invention first collects the calcareous purple soil sample air-dried through a 100-mesh sieve, and then uses a chemical extractant to extract step by step, that is, use different chemical reagents to extract the organic phosphorus and inorganic in the soil sample step by step Phosphorus component, the specific steps are as follows:
[0021] 1) Use deionized water to extract water-soluble phosphorus H from soil samples 2 O-P, including water-soluble organic phosphorus H 2 O-P o And water-soluble inorganic phosphorus H 2 O-P i ;
[0022] 2) In the soil sample after step 1), the anion exchange resin is used to extract the easily transformable phosphorus in the soil sample, namely resin-soluble phosphorus Resin-P, including resin-soluble organic phosphorus Resin-P o And resin-soluble inorganic phosphorus Resin-P i ;
[0023] 3) Sodium bicarbonate NaHCO is used in the soil sample after step 2) extraction 3 , Am...
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