Changes in chemical characteristics of Virginia soils receiving alum-amended broiler litter. (S11-warren615396-poster)
Authors:
J.G. Warren* - Virginia Tech S.B. Phillips - Virginia Tech G.L. Mullins - Virginia Tech
Abstract:
The objective of this laboratory study was to evaluate changes in extractable P, and exchangeable Al as a function of soil type, soil pH, and application rate of alum-amended and non-amended broiler litters.
Three VA soils, the Bojac sandy loam, Davidson loam, and Frederick silt loam, were evaluated. Soil pH was adjusted to 5.5, 4.5, or left at normal field pH. Fertilizer sources included non-amended litter, 5% and 10% alum-amended litter, and K2HPO4. All sources were applied to soil at rates of 150, 300, and 450 mg P2O5/ kg. The Davidson soil received an additional rate of 600 mg P2O5/ kg because of its high P adsorption capacity. Each treatment was replicated three times. Soils were moistened to 50 percent of field capacity and incubated at 25 degrees C. Sub-samples were taken from each
experimental unit 1, 3, 6, and 12 months after treatment applications and tested for Mehlich
I-extractable P, H2O-extractable P, Exchangeable Al and pH. The concentration of H2O-extractable P as a function of source followed the trend: K2HPO4 greater than normal litter greater than 5% alum litter greater than 10% alum litter. The exchangeable Al concentration was highly correlated with soil pH and did not deviate as a function of alum-amended litter application.
Speaker Information: Jason Warren, Virginia Tech, 6843 Cove Hollow Rd., Elliston, VA 24087; Phone:
(540) 231-4521; E-mail: [email protected]
Session Information: Monday, November 3, 2003, 4:00 PM-6:00 PM Presentation Start: 4:00 PM (Poster Board Number: 1333) Keywords: Alum; Poultry Litter; Phosphorus; Aluminum