Phosphorus speciation and sorption-desorption characteristics in heavily manured soils

Zhengxia Dou, C. F. Ramberg, J. D. Toth, Y. Wang, A. N. Sharpley, S. E. Boyd, C. R. Chen, D. Williams, Z. H. Xu

Research output: Contribution to journalArticlepeer-review

103 Scopus citations


Managing heavily manured soils for decreased P loss to waters requires improved understanding of the chemical and sorption-desorption characteristics of P in these soils. We used soils from agricultural fields receiving ≥8 yr of dairy, poultry, swine manure or spent mushroom compost for the determination of P functional groups in NaOH-EDTA extracts by solution 31P nuclear magnetic resonance (NMR) spectroscopy, degree of P saturation (DPS), and P sorption-desorption isotherms. The 31P NMR results show that inorganic orthophosphate was the primary form of P in manure treated (79-93% of total extract P) and untreated soils (33-71%). Pyrophosphate and phosphate monoesters were identified in all soils, whereas phosphate diesters were present in small proportions (<3%) in only a few soils. Polyphosphate, a more condensed form of inorganic P, was present in seven out of nine manured soils (9-47 mg P kg -1, <2%) but absent in untreated soils. Concentrations of inositol hexakisphosphate (IHP), mostly myo-IHP plus some scyllo-\WV, were similar in manured soils (52-116 mg P kg -1, 2-8%) and untreated soils (43-137 mg P kg -1, 6-22%), suggesting a lack of IHP accumulation despite long-term manure applications, including poultry manures that are typically rich in IHP. Most of the treated soils had DPS ≈ 80 to 90% compared with 11 to 33% for the untreated samples. Results from P sorption isotherms showed that potential P release was 3 to 30 times greater from treated than untreated soils. The lack of IHP accumulation in soils receiving long-term manure applications implies that manure-derived IHP may not be biologically and environmentally benign.

Original languageEnglish (US)
Pages (from-to)93-101
Number of pages9
JournalSoil Science Society of America Journal
Issue number1
StatePublished - Jan 2009
Externally publishedYes

ASJC Scopus subject areas

  • Soil Science


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