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Abstract
The present work is carried out to1- investigate the effect of removal of organic matter, calcium carbonates, free iron oxides,and amorphous silica &alumina on phosphorus adsorption by separated soil clays,2- employ the langmuir equation on P adsorption 3- study the effect of treatments on some chemical properties of separated soil clays, maximum adsorption of phosphorus and its bonding energy to the clay fraction.