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Fig. 3. Inorganic phosphorus fractions of tested materials. The total mass (mg) of phosphorus per mass (kg) of material are provided above each column. The NaOH-Pi represents the inorganic P in the NaOH extracted solution. The NaOH-Po represents the amount of organic phosphorus in the NaOH extract. The inorganic phosphorus was calculated as the difference between total P and soluble reactive P in the NaOH solution.
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