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United States Department of Agriculture

Agricultural Research Service

Title: Assessing Lability of Phosphorus Forms in Biosolids by Sequential Fractionation and Phosphatase Hydrolysis)

Author
item He, Zhongqi
item Honeycutt, Charles
item Toor, Gurpal
item Haggard, Brian
item Zhang, Hailin
item Dou, Zhengxia

Submitted to: Agronomy Abstracts
Publication Type: Abstract only
Publication Acceptance Date: 4/28/2008
Publication Date: 7/13/2008
Citation: He, Z., Honeycutt, C.W., Toor, G.S., Haggard, B.E., Zhang, H., Dou, Z. 2008. Assessing Lability of Phosphorus Forms in Biosolids by Sequential Fractionation and Phosphatase Hydrolysis. Plants and Soils, Montreal '08. pg. 45-46.

Interpretive Summary:

Technical Abstract: Biosolids may contain a significant amount of phosphorus (P). However, bioavailability of biosolid P is related not only to total P content but also to particular P forms. We examined the P forms in biosolids by sequential fractionation coupled with enzymatic hydrolysis. Biosolid P was found in the four fractions in the following order: H2O<0. 5 M NaHCO3<0.1M NaOH<1 M HCl. Organic P was present in the extracts in different forms, mostly as unhydrolyzable P. In the H2O and NaHCO3 fractions, phytate P (45 and 221 mg P kg-1 of dry matter, respectively) was greater than simple monoester P (35 and 88 mg P kg-1 of dry matter, respectively). In the NaOH and HCl fractions, the distribution was different with less phytate P (117 and 186 kg-1 of dry matter, respectively) than simple monoester P (342 and 1543 kg-1 of dry matter, respectively). Polynucleotide-like P was rarely detected in all four fractions. Results from this study may aid in correct interpretation of P lability in biosolid amended soils and help in assessing the true fate of P from biosolids.

Last Modified: 8/24/2016
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