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Phosphorus Speciation in Dairy Manure-Amended Calcareous Soils

Citation

Weyers, Eva. (2016). Phosphorus Speciation in Dairy Manure-Amended Calcareous Soils. Theses and Dissertations Collection, University of Idaho Library Digital Collections. https://www.lib.uidaho.edu/digital/etd/items/weyers_idaho_0089n_10953.html

Title:
Phosphorus Speciation in Dairy Manure-Amended Calcareous Soils
Author:
Weyers, Eva
Date:
2016
Embargo Remove Date:
2017-04-13
Keywords:
calcareous soil phosphorus soil chemistry spectroscopy
Program:
Environmental Science
Subject Category:
Soil sciences; Environmental science
Abstract:

Growth in the dairy industry in Idaho has created a surplus of manure that may be a useful source of fertilizer for crops. The purpose of this project was to determine the effects of manure amendments on phosphorus (P) speciation in the calcareous soils of southern Idaho. Sequential extraction, nuclear magnetic resonance (31P-NMR) spectroscopy, and x-ray absorbance near-edge spectroscopy (XANES) analysis were used to analyze changes in the soil caused from manure amendments over a three-year period. Results show an increase in total P concentration over three years with annual manure amendments of 17 Mg/ha and 52 Mg/ha (dry weight). NMR and XANES linear combination fitting results show all soil samples collected were comprised of majority apatite (54-74%), along with adsorbed phosphorus (25-35%) and organic phosphorus (monoesters and diesters) (0-19%). Adsorption isotherms were also prepared to examine the impact of manure on P adsorption to calcite. Results showed that percent P adsorbed dropped significantly in the presence of manure. XANES analysis also found distinct differences in the P minerals formed in the presence of manure, suggesting manure affects P solubility and mineralization. Increases in total soil phosphorus, as well as overall solubility, may affect phosphorus loading to nearby surface waters if not carefully monitored. The results also show the benefits of using multiple analytical methods to provide an in-depth profile of the phosphorus species present.

Description:
masters, M.S., Environmental Science -- University of Idaho - College of Graduate Studies, 2016
Major Professor:
Strawn, Daniel
Committee:
Johnson-Maynard, Jodi; Moore, Amber
Defense Date:
2016
Identifier:
Weyers_idaho_0089N_10953
Type:
Text
Format Original:
PDF
Format:
application/pdf

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