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United States Department of Agriculture

Agricultural Research Service

Research Project: NUTRIENT CYCLING AND UTILIZATION ON ORGANIC DAIRY FARMS Title: Exploring Organic Phosphates in Sequentially-Extracted Hydrochloric Acid Fractions of Soil and Animal Manure

Authors
item He, Zhongqi
item Fortuna, Ann Marie
item Honeycutt, Charles
item Griffin, Timothy
item Senwo, Zachary - ALABAMA A&M UNIV
item Tazisong, Irenus - ALABAMA A&M UNIV

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: September 10, 2005
Publication Date: November 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

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: 11/22/2014
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