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- Title
Phosphorus Sorption and Redistribution on Soil Solid Phase in a Brazilian Haplorthox Amended with Biosolids.
- Authors
OliveiraMunhoz, Ricardo de; Berton, Ronaldo Severiano; de Camargo, Otávio Antonio
- Abstract
Land application of biosolids (SS) can cause a buildup of phosphorus (P) in the top soil. The changes in the soil P characteristics may be assessed by the sorption isotherm and the sequential fractionation techniques. Samples of Haplorthox were collected from a field experiment where maize was cultivated for two years, after two applications of SS originated from two cities of São Paulo State, Brazil. SS applications added a total of 125, 250, 500, 1000 and 2000 kg ha-1of P in the area. To perform the sorption isotherms and obtain P maximum sorption capacity (Qmax) and the binding energy, soil samples were submitted to increasing P concentration solutions until equilibrium was reached. Sequential fractionation was done by a sequential extraction with CaCl2, NaHCO3, NaOH, HCl, and HNO3 + HClO4 (residual). Addition of biosolids from both cities to the soil decreased Qmax and the binding energy obtained by the Langmuir equation. SS additions changed the P fractions distribution in the soil by increasing the labile fractions (P-CaCl2 and P-NaHCO3) and the moderately labile fraction (P-NaOH) by 11.2% and 20.3%, respectively, in detriment of the most resistant P fraction.
- Subjects
SAO Paulo (Brazil : State); BRAZIL; SOIL absorption &; adsorption; PHOSPHORUS; SEWAGE sludge; ISOTHERMAL surfaces (Thermodynamics)
- Publication
Applied & Environmental Soil Science, 2011, Vol 2011, p1
- ISSN
1687-7667
- Publication type
Article
- DOI
10.1155/2011/283061