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- W2090167137 abstract "Abstract Retention capacities of phosphorus (P) in three soils (sandy loam, sandy clay, and sandy clay loam) and in soil mixed with 50 g kg −1 (5% ww) digested sewage sludge (Al‐ or Fe‐precipitated) were measured in a laboratory study. Artificial rainwater, continuously leached through different samples, released about 15% of the total‐P content (0.6–1.1 g P kg −1 ) of the soils. Adding Fe‐precipitated sludge to the soil approximately doubled the P‐concentration (1.1 to 1.7 g P kg −1 ) in the samples, and 20% was released. Up to 43% of the total‐P (1.1 g P kg −1 ) was released when Al‐precipitated sludge was mixed with the sandy loam soil. The release process was described by a first‐order decay equation, and release rates between 0.04 and 0.07 d −1 or 35 mm water passing −1 were obtained. The released amounts could be considered as potential mobile phosphate under the experimental conditions used and are compared with potentially crop‐available P. Phosphorus fractionation revealed that P adsorbed to Fe and Al was more or less exhausted, declining from about 35% at the start of the experiment to 5% of tot‐P by the end. The inert P‐pool increased, indicating that P transformations favored the production of more stable compounds. The accumulation of P in urban regions and the risk for nonpoint pollution of surface‐ and groundwaters are discussed." @default.
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- W2090167137 date "1997-03-01" @default.
- W2090167137 modified "2023-10-16" @default.
- W2090167137 title "Potential Release of Phosphorus from Soil Mixed with Sewage Sludge" @default.
- W2090167137 doi "https://doi.org/10.2134/jeq1997.00472425002600020026x" @default.
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