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Evolution of humic fraction in a redoxi-luvisol after application of granular sewage sludge.

Guiresse, Agnès Maritchù and Seibane, Lydie and Scheiner, Javier David and Gutiérrez-Boem, Flavio H. and Kaemmerer, Michel and Gavalda, David and Hafidi, Mohamed and Revel, Jean-Claude Evolution of humic fraction in a redoxi-luvisol after application of granular sewage sludge. (2004) Agrochimica, 48 (1-2). 62-72. ISSN 0002-1857

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Agricultural use of biosolids is a way of returning carbon and nutrients to soils and a rational disposal of sewage sludge. Its use in rural environments faces some problems related to its high water content and readily fermentable status. An alternative procedure is to heat-dry the biosolids, which result in a granular product that can be handled with the same equipment used to spread granular fertilisers. A field experiment was carried out on a redoxi-luvisol in Toulouse (France) to evaluate the effects of the application of heat-dried biosolids on the amount of soil organic carbon and on the characteristics of humic and fulvic acid fractions of soil organic matter. It also sought to compare the effects of heat-dried biosolids and inorganic fertilisers on corn growth and yield. Three treatments were established by addition of granular biosolid, inorganic fertilisers and a non-fertilised control. Maize was cropped and soil organic matter content and some humic substance characteristics were monitored during a year after biosolid application. Even though the amount of carbon added as biosolid represented 28% of initial soil carbon content, biosolid application had no relevant effects either on soil organic matter content or on soil humic substance characteristics. Humic acid composition, molecular size and structure were not affected. Biosolid carbon seems to have been readily mineralised during crop cycle, so it functioned as a nutrient source without affecting soil organic matter quality

Item Type:Article
HAL Id:hal-03483223
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > University of Cadi Ayyad - UCAM (MOROCCO)
Other partners > Universidad de Buenos Aires (ARGENTINA)
Laboratory name:
Deposited On:31 Aug 2017 09:28

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