Use of Aluminum- and Iron-Rich Residues to Immobilize Phosphorus in Poultry Litter and Litter-Amended Soils
- Eton E. Codling *,
- Rufus L. Chaney and
- Charles L. Mulchi
Poultry production is concentrated on Maryland's eastern shore on areas with sandy soils low in sesquioxides. Water quality has been affected by runoff and leaching of phosphorus from poultry litter-amended fields. Phosphorus movement is of major concern because P is a limiting nutrient for eutrophication in surface water. The objectives of this study were to (i) evaluate the ability of Al-rich drinking water treatment residue (DWTR) and iron-rich residue (IRR) to reduce water-soluble P and Bray and Kurtz no. 1-extractable phosphorus (BK-1 P) in poultry litter and three long-term litter-amended soils and (ii) determine the effects of these residues on pH and electrical conductivity (EC) in the amended litter and soils. Poultry litter and soils were treated with four rates of DWTR and IRR and incubated for 7 wk at 25°C. Litter and soils were sampled at 2, 4, and 7 wk. Both residue materials increased the pH of the litter and the soils. The DWTR was more effective in reducing both water-soluble P and BK-1 P in litter at all rates. At the 25 and 50 g kg−1 rates, reductions in water-soluble P with IRR were comparable with that of DWTR, but DWTR was twice as effective as IRR in reducing BK-1 P concentration. The results showed that water-soluble P and BK-1 P in poultry litter and long-term litter-amended soils can be substantially reduced by incorporating residues rich in Al and Fe; these residues may be useful for reducing P runoff and leaching from poultry litter and litter-amended fields.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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