Concentration of phosphorus compounds in two steps extracts of animal manures determined by Murphy-Riley (1962).

Note:†NaHCO3-Pi and NaHCO3-Po are NaHCO3-extractable inorganic and organic phosphorus; NaOH/EDTA-Pi and NaOH/EDTA-Po are NaOH/EDTA-extractable inorganic and organic phosphorus.‡Inorganic phosphorus (Pi) in each extract was determined by Murphy-Riley (1962). Organic phosphorus (Po) in each extract was calculated as the difference between Pt and Pi. Values in parenthesis are the percentage of total manure phosphorus in each extract.¶Residual P was determined using H2SO4-H2O2 digestion of the residual.