Net N immobilisation during the biodegradation of mucilage in soil as affected by repeated mineral and organic fertilisation |
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Authors: | Christophe Nguyen Fabienne Froux Sylvie Recous Thierry Morvan Christophe Robin |
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Affiliation: | (1) UMR INPL(ENSAIA)-INRA Agronomie et Environnement Nancy-Colmar, 2 avenue de la forêt de Haye, Vandoeuvre les Nancy, 54500, France;(2) Present address: UMR 1220 “Transfert sol-plante et cycle des éléments minéraux dans les écosystèmes cultivés”, Centre INRA de Bordeaux-Aquitaine, 71, avenue Edouard Bourlaux, BP 81, Villenave d’Ornon, 33883, France;(3) INRA, Unité d’Agronomie, rue Fernand Christ, Laon, 02007, France;(4) UMR INRA-ENSAR SAS, 4 rue de Stang Vihan, Quimper, 29000, France |
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Abstract: | Repeated fertilisation of crops with manure commonly increases both the amount and the quality of soil organic matter, the
mineralisation of which strongly determines the availability of N to plants. In the rhizosphere, the microbial mineralisation/immobilisation
of N is enhanced due to rhizodeposition (release of organic compounds from roots). In this work, we studied N transformations
during incubation of maize root mucilage in soils that had been previously fertilized with composted pig manure or with ammonium
nitrate for 7 years. Our work revealed mucilage was rapidly mineralised (average half-life of 3 days), inducing a rapid N
immobilisation of 94 mg N g−1 of mucilage C, followed by a slow remineralisation. Fertilisation with manure induced a persistent stimulation of the soil
organic matter mineralisation, leading to an enhanced content of soil inorganic N (+23% in 58 days of incubation). Due to
this stimulation of microbial activity in the soil fertilized with manure, the decrease in inorganic N during the biodegradation
of mucilage lasted a shorter time as compared to the mineral fertilisation. However, the type of fertilisation did not significantly
change the amount of N immobilised. |
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Keywords: | Immobilisation Manure Mineralisation Root mucilage Nitrogen Rhizodeposition |
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