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Phosphorus Speciation in Manure-Amended Alkaline Soils

^a Department of Plant, Soil & Entomological Sciences, University of Idaho, Moscow, ID 83844-2339
^b Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305-2115

View larger version (22K): [in a new window]   Fig. 1. Phosphorus-31 nuclear magnetic resonance (NMR) spectra of manure and lagoon samples extracted with 0.5 M NaOH + 0.1 M Na2EDTA. The NMR parameters were 202.45 MHz, 90° pulse, 0.68-s acquisition, 4.32-s delay, 25°C, 8000 scans, and 20-Hz line broadening. The * marks the diagnostic peak for phytic acid, and the insets show expanded orthophosphate monoester and diester regions (off-set for the manure sample), and an expanded phosphonate region for the manure sample.

View larger version (23K): [in a new window]   Fig. 2. Phosphorus-31 nuclear magnetic resonance (NMR) spectra of solid-manure-amended (A) and lagoon-manure-amended (B) surface and subsurface soils extracted with 0.5 M NaOH + 0.1 M Na2EDTA. The NMR parameters were 202.45 MHz, 90° pulse, 0.68-s acquisition, 4.32-s delay, 25°C, 8000 scans, and 20-Hz line broadening. The insets show expanded orthophosphate monoester and diester regions.

View larger version (39K): [in a new window]   Fig. 3. Results of sequential P extraction of manure-amended and lagoon-manure-amended surface and subsurface soils. The fractions shown are exchangeable, Ca-bound, Fe and Al oxide, organic matter, and residual P (%).