Phosphorus reactions and leaching potential in soils amended with sewage sludge

Siddique, M. T., Robinson, J. S. ORCID: https://orcid.org/0000-0003-1045-4412 and Alloway, B. J. (2000) Phosphorus reactions and leaching potential in soils amended with sewage sludge. Journal of Environmental Quality, 29 (6). pp. 1931-1938. ISSN 1537-2537 doi: 10.2134/jeq2000.00472425002900060028x

Abstract/Summary

The objective of this study was to evaluate the leaching potential of P from a range of sewage sludge- or P fertilizer (monocalcium phosphate)-amended topsoils that had different P contents. Leaching trials (70 d) were conducted in 30-cm-long PVC columns; P-related parameters were then determined at different depths in the leached soils. In most cases, more (P < 0.01) P was released from the P-fertilized than sludge-treated soils. Increasing native Olsen P from 15 to 62 mg kg−1 had negligible effect on P release; however, there was a sharp increase in P leached between 92 and 134 (maximum) mg Olsen P kg−1. This increase was much greater in the P-fertilized than sludge-treated soils. At all depths in all leached soils, resin P decreased in the order: P fertilized > sludge > control. At the lowest depth (16–20 cm) of the leached soil, the degree of P sorption saturation decreased in the same order and was related curvilinearly (P < 0.001) to cumulative P leached (at 70 d). This relationship demonstrates the importance of P sorption saturation in controlling P leaching in sludge- and fertilizer-treated soils. The more rapid rate of P saturation and P leaching in P-fertilized than sludge-treated soils emphasizes the role of the P source in adsorption-desorption processes.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/119282
Item Type	Article
Refereed	Yes
Divisions	Science > School of Archaeology, Geography and Environmental Science > Department of Geography and Environmental Science
Publisher	Wiley
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