Abstract
SynopsisPhosphorus of seven surface soils and corresponding subsoils was fractionated. Iron and aluminum phosphates accounted for more than half of the total P in surface material and about two‐thirds of that in subsoils. Organic P represented about one‐third of the total P in surface soils but only about one‐fifth in subsoils; “adsorbed” P and acid soluble P represented about 10% and 5%, respectively, of the total. Two distinctly different methods were used to measure “chemically available” phosphorus. Each method was satisfactory.
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