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Analysis methods for the determination of anthropogenic additions of P to agricultural soils
- Richard L. Haney, Virginia L. Jin, Mari-Vaughn V. Johnson, Elizabeth B. Haney, R. Daren Harmel, Jeffrey G. Arnold, Michael J. White
- Open journal of soil science 2015 v.5 no.2 pp. 59-68
- accuracy, agricultural soils, anthropogenic activities, colorimetry, environmental impact, fertilizer application, mineralization, phosphorus, risk, soil analysis, soil nutrients, spectral analysis
- Phosphorus additions and measurement in soil is of concern on lands where biosolids have been applied. Colorimetric analysis for plant-available P may be inadequate for the accurate assessment of soil P. Phosphate additions in a regulatory environment need to be accurately assessed as the reported levels may not correlate well to environmental risk. In order to accurately assess potential P runoff and leaching, as well as plant uptake, we must be able to measure organic P mineralized by the soil biotic community. Soils with varying rates of biosolid application were evaluated for mineralized organic P during a 112-day incubation using the difference between P measured using a colorimetric rapid-flow analyzer (RFA) and axial flow inductively coupled plasma optical emission spectroscopy (ICP-OES). An increase in P mineralized from the treated soils was observed from analysis with ICP-OES but not the RFA. These results confirm that organic P concentrations increased due to increasing biosolid application; however, traditional soil testing using an RFA for detection would not accurately portray these increases in soil P concentration and potential P losses from treated soils.