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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Soil aggregate stability improvement with urban composts of different maturities
Soil Science Society of America Journal, Volume 71, No. 2, Year 2007
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Description
Organic matter controls aggregate stability in loam soils. Intensive farming can lead to a decrease in soil organic matter content. In areas where livestock have disappeared, the recycling of composted urban organic wastes on agricultural soils may represent a valuable source of organic matter for restoring soil organic matter content. The effects on the aggregate stability of a silt loam soil of three urban composts (a municipal solid waste compost, a co-compost of sewage sludge and green waste, and a biowaste compost) sampled at two different stages of maturity (immature and mature composts) were studied during laboratory incubations. The results were related to (i) compost organic matter biodegradability, biochemical fractions, and humic substance content, (ii) microbial activity evaluated through organic C mineralization and microbial and fungal biomass evolution, (iii) hot-water-extractable polysaccharides, and (iv) aggregate hydrophobicity as revealed by the water drop penetration time test. Both immature and mature composts increased aggregate stability via different mechanisms. After immature compost addition, the enhanced microbial activity mainly improved aggregate stability by increasing water repellency. The fungal biomass was particularly involved in aggregate stabilization. The municipal solid waste compost was more efficient at improving resistance to slaking, probably because of its larger labile organic pool that enhanced microbial activity. The addition of mature composts immediately improved aggregate stability with similar efficiency for all composts but to a lesser extent than improvements from immature composts. The observed increase of interparticular cohesion could be due to the inward diffusion of binding organic substances within the aggregates. © Soil Science Society of America.
Authors & Co-Authors
Annabi, Mohamed
Tunisia, Tunis
University of Carthage, Institut National de la Recherche Agronomique de Tunisie
France, Thiverval-grignon
Écologie Fonctionnelle et Écotoxicologie Des Agroécosystèmes
France, Paris
Veolia Environnement sa
Houot, Sabine
France, Thiverval-grignon
Écologie Fonctionnelle et Écotoxicologie Des Agroécosystèmes
Francou, Cédric
France, Paris
Veolia Environnement sa
Poitrenaud, Maelenn
France, Paris
Veolia Environnement sa
Le Bissonnais, Yves
France, Montpellier
Laboratoire D'etude Des Interactions Sol - Agroecosysteme - Hydrosysteme Lisah
Statistics
Citations: 255
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.2136/sssaj2006.0161
ISSN:
03615995
Research Areas
Environmental