Phosphorus retention in calcareous soils and the effect of organic matter on its mobility |
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| Authors: | Ray von Wandruszka |
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| Institution: | (1) Department of Chemistry, University of Idaho, Moscow, ID 83844-2343, USA |
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| Abstract: | A survey of the interactions between phosphorus (P) species and the components of calcareous soils shows that both surface
reactions and precipitation take place, especially in the presence of calcite and limestone. The principal products of these
reactions are dicalcium phosphate and octacalcium phosphate, which may interconvert after formation. The role of calcium carbonate
in P retention by calcareous soils is, however, significant only at relatively high P concentrations – non-carbonate clays
play a more important part at lower concentrations. In the presence of iron oxide particles, occlusion of P frequently occurs
in these bodies, especially with forms of the element that are pedogenic in origin. Progressive mineralization and immobilization,
often biological in nature, are generally observed when P is added as a fertilizer. |
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