Long-term effects of metal-containing farmyard manure and sewage sludge on soil organic matter in a fluvisol |
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Authors: | Corinne Parat,Ré mi Chaussod,Francis Andreux |
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Affiliation: | a UMR INRA 1229, Microbiologie et Géochimie des Sols, Centre des Sciences de la Terre, 6 Bd Gabriel, 21000 Dijon, France b UMR INRA 1229, Microbiologie et Géochimie des Sols, Laboratoire de Microbiologie des Sols, 17 rue de Sully, 21034 Dijon cedex, France |
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Abstract: | Our aim was to establish the long-term effects of repeated applications after 20 y of organic amendments (farmyard manure at 10 t ha−1 y−1, and urban sewage sludge at two different rates, 10 t ha−1 y−1 and 100 t ha−1 every 2 y) on the quality of a sandy and poorly buffered soil (Fluvisol, pH 6). Chemical characteristics and biodegradability of the labile organic matter, which is mainly derived from microbial biomass and biodegradation products of organic residues, were chosen as indicators for soil quality. The organic C content had reached a maximal value (30.6 g C kg−1 in the 100 t sludge-treated soil), i.e. about 2.5 times that in the control. Six years after the last application, the organic C content and the microbial biomass content remained higher in sludge-treated soils than in the control. In contrast, the proportion of labile organic matter was significantly lower in sludge-treated soils than in manure-treated and control soils. The labile organic matter of sludge extracts appeared less humified than that of manure-treated and control soils. |
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Keywords: | Sewage sludge Farmyard manure Cu Zn Pb Labile organic matter Sandy soils Soil quality |
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