Field survival of the phytostimulator Azospirillum lipoferum CRT1 and functional impact on maize crop, biodegradation of crop residues, and soil faunal indicators in a context of decreasing nitrogen fertilisation
Autor: | Denis Félix, Matthias P. Lutz, Yvan Moënne-Loccoz, Jérôme Cortet, Geneviève Défago, Ezékiel Baudoin, René Bally, Hamdy El Zemrany, Jacqueline Haurat, Nicolas Maughan, André Chabert |
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Přispěvatelé: | Laboratoire d'Ecologie Microbienne - UMR 5557 (LEM), Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Ecole Nationale Vétérinaire de Lyon (ENVL), Université de Lyon-Université de Lyon-Ecole Nationale Vétérinaire de Lyon (ENVL)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Centre National de la Recherche Scientifique (CNRS) |
Jazyk: | angličtina |
Rok vydání: | 2006 |
Předmět: |
Crop residue
Soil biology [SDV]Life Sciences [q-bio] Soil Science Context (language use) Biology Rhizobacteria Litter bags Microbiology Soil fauna 03 medical and health sciences Fusarium Poaceae Microbial inoculant 2. Zero hunger 0303 health sciences Rhizosphere 030306 microbiology food and beverages 04 agricultural and veterinary sciences 15. Life on land Ecological impact Deoxynivalenol Maize Agronomy Azospirillum lipoferum 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Azospirillum rhizosphere Phytostimulator |
Zdroj: | Soil Biology and Biochemistry Soil Biology and Biochemistry, Elsevier, 2006, 38 (7), pp.1712-1726. ⟨10.1016/j.soilbio.2005.11.025⟩ |
ISSN: | 0038-0717 |
Popis: | International audience; Heavy nitrogen fertilisation is often implemented in maize cropping systems, but it can have negative environmental effects. Nitrogen-fixing, phytohormone-producing Azospirillum plant growth-promoting rhizobacteria (PGPR) have been proposed as crop inoculants to maintain high yield when decreasing nitrogen fertilisation. In this context, agronomic and ecological effects of the inoculation of maize seeds with the PGPR Azospirillum lipoferum CRT1 were studied in two consecutive years. The inoculant was recovered from maize at 105 CFU g-1 root or higher. Inoculation enhanced root growth and development based on results of root biomass, rooting depth and/or parameters describing root system architecture, and a transient positive effect on shoot height was observed in the first year. Inoculation did not increase yield, but reducing mineral nitrogen fertilisation had only a minor effect on yield. This suggests that the lack of positive effect of the PGPR on yield was due to the fact that the whole field was heavily fertilised in years prior to the start of the experiment. Soil nitrogen levels decreased during the 2 years of the study, and the inoculant had no effect on residual soil nitrogen levels at harvest. Inoculation had no impact on Fusarium symptoms and concentration of the mycotoxin deoxynivalenol in maize kernels, but both were influenced by the interaction between inoculation and nitrogen fertilisation level. Inoculation did not influence meso/macrofaunal soil populations, but had a small but significant effect (smaller than the effect of added nitrogen) on decomposition, nitrogen mineralisation and mesofaunal colonisation of maize leaves (in litter bags). Overall, the ecological impact of seed inoculation with the PGPR A. lipoferum CRT1 was small, and its magnitude was smaller than that of chemical nitrogen fertilisation. |
Databáze: | OpenAIRE |
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