XANES Speciation of Phosphorus in Organically Amended and Fertilized Vertisol and Mollisol

摘要: Knowledge of the dominant P species present in soil following application organic amendments and fertilizer is important understanding fate environment. This study was performed to identify two calcareous soils, an Osborne series (Typic Humicryert) a Lakeland Calciudoll), treated with (biosolids hog dairy cattle manure) (monoammonium phosphate, MAP). Phosphorus 1s x-ray absorption near-edge structure (XANES) spectroscopy used speciate compounds these amended soils. The result showed that “adsorbed P” both For soil, unamended (control) those biosolids MAP contained appreciable amount hydroxyapatite (HAP), most thermodynamically favored Ca phosphate. In addition, soils or manures contain β-tricalcium phosphate (TRICAL), more soluble form than HAP. variety addition P.” While TRICAL found all except manure, HAP only soil. Overall, adsorbed P, likely through inner-sphere complexation, may not be readily available as source into will have limited solubility, thus, are probably very minor