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United States Department of Agriculture

Agricultural Research Service

Title: EXPLORING ORGANIC PHOSPHATES IN SEQUENTIALLY-EXTRACTED HYDROCHLORIC ACID FRACTIONS OF SOIL AND ANIMAL MANURE)

Author
item He, Zhongqi
item Fortuna, Ann marie
item Honeycutt, Charles
item Griffin, Timothy
item Senwo, Zachary
item Tazisong, Irenus

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract only
Publication Acceptance Date: 9/10/2005
Publication Date: 11/6/2005
Citation: He, Z., Fortuna, A., Honeycutt, C.W., Griffin, T.S., Senwo, Z.N., Tazisong, I.A. 2005. Exploring organic phosphates in sequentially-extracted hydrochloric acid fractions of soil and animal manure. ASA-CSSA-SSSA Annual Meeting Abstracts. ON CD

Interpretive Summary:

Technical Abstract: The Hedley sequential fractionation procedure has been widely used for investigating the forms and transformations of phosphorus (P) under various environmental conditions. Whereas this approach considers both inorganic and organic P to exist in water, NaHCO3 and NaOH fractions, inorganic P is assumed to only exist in the HCl fraction. This assumption has been widely accepted, leading researchers to measure only inorganic P in the HCl fraction and disregard the possibility that organic P might also be present in HCl extracts. In this study, we determined the concentrations of inorganic P, enzymatically hydrolyzable organic P, and total P of sequentially-extracted 1 M HCl fractions in 15 soils and eight animal manures to evaluate the validity of categorically excluding organic P components in 1 M HCl fractions using the Hedley method. Our data indicate that although some samples did contain negligible amounts of organic P in HCl fractions, other samples contained significant quantities of organic P. The concentrations of organic P were even greater than those of inorganic P in one soil and two manures. This indicates that excluding organic P determination in HCl fractions may lead to erroneous interpretation. Determination and monitoring of HCl organic P may provide insight into the fates and interchange of P species in soil and animal manure.

Last Modified: 8/24/2016
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