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How Accurate Is the Assessment of Phosphorus Pools in Poultry Litter by Sequential Extraction?

^a Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom
^b Department of Plant and Soil Sciences, University of Delaware, 152 Townsend Hall, Newark, DE 19711

View larger version (33K): [in a new window]   Fig. 1. Concentrations of P, Ca, Al, and Fe in the 125- to 420-µm size separate of the alum-amended poultry litter sample PL 181.

View larger version (32K): [in a new window]   Fig. 2. Concentrations of P, Ca, Al, and Fe in the <125-µm size separate of the alum-amended poultry litter sample PL 181.

View larger version (20K): [in a new window]   Fig. 3. Single-pulse, proton-decoupled magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectra (left column) and cross-polarization magic angle spinning (CP–MAS) spectra (right column) of the coarse size separate of poultry litter sample PL 181. Samples are sequentially extracted from top to bottom up to the extraction step indicated.

View larger version (19K): [in a new window]   Fig. 4. Single-pulse, proton-decoupled magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectra (left column) and cross-polarization magic angle spinning (CP–MAS) spectra (right column) of the fine size separate of poultry litter sample PL 181. Samples are sequentially extracted from top to bottom up to the extraction step indicated.

View larger version (14K): [in a new window]   Fig. 5. Cross-polarization magic angle spinning (CP–MAS) 31P nuclear magnetic resonance (NMR) spectra of the fine size separate of poultry litter sample PL 181 after extraction with 0.1 M NaOH (top) and 1.0 M HCl (bottom).