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Phosphorus speciation in manure-amended alkaline soils
Jeremy C Hansen1, Barbara J Cade-Menun, Daniel G Strawn
1Department of Plant, Soil & Entomological Sciences, University of Idaho, Moscow, ID 83844-2339, USA.
Journal of Environmental Quality
|July 16, 2004
Summary
Manure application affects soil phosphorus (P) forms. Solid and liquid dairy manures contain similar organic P, but solid manure has higher P content. Soil P speciation differs between surface and subsurface layers after long-term amendment.
Area of Science:
- Soil Science
- Environmental Chemistry
- Agricultural Science
Background:
- Manure application is a common practice for soil amendment.
- Phosphorus (P) in manure exists in organic and inorganic forms.
- Understanding P speciation in manure and amended soils is crucial for nutrient management.
Purpose of the Study:
- To investigate P speciation in solid and liquid dairy manure.
- To analyze the influence of long-term manure amendment on soil P speciation.
- To compare P dynamics in surface and subsurface soils.
Main Methods:
- Solution (31)P nuclear magnetic resonance (NMR) spectroscopy.
- Conventional P fractionation and speciation techniques.
- Analysis of dairy solid manure, liquid lagoon manure, and amended soils.
Main Results:
- Solid and lagoon manures exhibit similar P forms, with ~30% organic P (orthophosphate monoesters).
- Solid manure has higher total P concentration on a dry weight basis.
- Manure type influenced subsurface soil P concentration and organic P fraction; phytic acid was the dominant organic P form.
Conclusions:
- Dairy manure P speciation is consistent across storage types.
- Long-term manure application alters soil P speciation, with variations between surface and subsurface soils.
- Phytic acid is a key organic P component in manure-amended soils, impacting P dynamics.