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Alum Amendment Effects on Phosphorus Release and Distribution in Poultry Litter–Amended Sandy Soils

^a Department of Plant and Soil Sciences, University of Delaware, 152 Townsend Hall, Newark, DE 19716
^b U.S. Geological Survey, Mail Stop 465, 345 Middlefield Road, Menlo Park, CA 94025

View larger version (20K): [in a new window]   Fig. 1. Long-term (25 d) phosphorus release from poultry litter (PL)–treated and untreated Coastal Plain soils (pH 6) after 1 wk of incubation as determined by the batch desorption technique using 2 mM 2-(4-morpholino)-ethane sulfonic acid (MES) buffer and 0.098 M NaCl (pH 6) desorptive solution with a 1:30 solid to solution ratio. Soil + lit, soil incubated with control litter; soil + al-lit, soil incubated with alum-amended litter. Significant differences between the mean cumulative P release are denoted by different letters at the end of the desorption curve. (A) Evesboro loamy sand, (B) Rumford loamy sand, and (C) Pocomoke sandy loam.

View larger version (19K): [in a new window]   Fig. 2. Short-term (24 h), stirred-flow phosphorus release from poultry litter (PL)–treated and untreated Coastal Plain soils (pH 6) after 1 wk of incubation and 24 h of hydration in 2 mM 2-(4-morpholino)-ethane sulfonic acid (MES) buffer and 0.098 M NaCl (pH 6) desorptive solution with a 0.4:7.6 solid to solution ratio. Soil + lit, soil incubated with control litter; soil + al-lit, soil incubated with alum-amended litter. Experiments were not replicated for the short-term study. (A) Evesboro loamy sand, (B) Rumford loamy sand, and (C) Pocomoke sandy loam.