Translations:Benutzer:Arian/Klett-Mini-Test/1598/en

The stability of phosphorus (HPO₄)^2– that has passed into solution through mineral weathering and decomposition of organic material is a consequence of its reactivity. It enters into new compounds above all with calcium, forming secondary calcium phosphates; furthermore it is absorbed by aluminium and iron hydroxides, which for their part form complexes with humic and fulvic acids. In suspension it occurs in soil colloids and adsorbed onto clay minerals and humus substances. Up to 80% of the organic phosphorus compounds are present in the form of phytates (calcium and magnesium salts of inositol hexaphosphoric acid); a further 5 to 10% are found in the nucleic acids of the cell nuclei of plants and microorganisms.