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Phosphate Supply Pattern of Various Soils
Author(s) -
Fried Maurice,
Shapiro R. E.
Publication year - 1956
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1956.03615995002000040007x
Subject(s) - phosphate , soil water , leaching (pedology) , phosphorus , chemistry , environmental chemistry , adsorption , desorption , environmental science , agronomy , soil science , biology , biochemistry , organic chemistry
The pattern of phosphate supply in soils of different phosphate level was investigated by three techniques: continuous soil leaching, successive hourly equilibrations, and intermittent leaching in the presence of growing plants. All three approaches gave similar results. The pattern of phosphate supply for the four low phosphate‐fixing soils could be predicted by assuming the phosphate released was a desorption phenomenon as described by the Langmuir adsorption isotherm. The pattern of phosphàte supply for the three high phosphate‐fixing soils could be predicted by assuming that in the presence of water a saturated solution of a chemical compound was formed. The level of phosphorus in the initial water extract was not a good indication of plant‐available phosphorus. Both the intensity of soil phosphate supply and the capacity of the soil to rapidly renew this supply must be evaluated to adequately describe plant‐available phosphorus in the soil.