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Phosphorus dynamics in soils receiving chemically treated dairy manure.
1Biological Systems Engineering Department, 460 Henry Mall, University of Wisconsin, Madison, WI 53706, USA.
Journal of Environmental Quality
|November 13, 2004
Summary
Chemical manure treatments with Al or Fe salts reduce phosphorus (P) solubility in soils, especially those with high background P. Calcium (Ca)-treated manure, however, increases P availability, making it suitable for P-deficient soils.
Area of Science:
- Soil Science
- Environmental Chemistry
- Agronomy
Background:
- Chemical treatment of animal manure with Al, Fe, and Ca salts concentrates phosphorus (P).
- Limited data exists on the fate of nutrients in soils amended with chemically treated manure.
Purpose of the Study:
- To investigate the impact of Al-, Fe-, and Ca-treated manure on phosphorus (P) dynamics in different soil types.
- To determine the effect of these treatments on P solubility and fractionation over time.
Main Methods:
- Incubation study (1 day to 2 years) with three soils and four manure treatments (untreated, Al-, Fe-, Ca-treated).
- Analysis of Bray-1 P and water-extractable phosphorus (WEP) at eight time points.
- Determination of P distribution among soluble, bound (Al-, Fe-, Ca-), organic, and residual fractions at 1 day and 1 year.
Main Results:
- Al- or Fe-treated manure decreased water-extractable P (WEP) in high-P soils, while Ca-treated manure increased WEP.
- Bray-1 P increased in the order: Ca-treated > Al-treated ≥ untreated > Fe-treated > control.
- P solubility decreased initially then stabilized or slightly increased, with Al- or Fe-treatments showing greater P retention.
Conclusions:
- Al- or Fe-treated manure effectively reduces P solubility, beneficial for preventing P loss in high-P soils.
- Ca-treated manure enhances P availability and is recommended for soils requiring increased P levels.
- Understanding P fate in chemically treated manure-amended soils is crucial for sustainable nutrient management.