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Poster De Conférence Année : 2014

Microbial biomass and catabolic activities in the rhizosphere as impacted by P fertilization, a field study

Résumé

In the context of the EURoot project, a large maize phenotyping field experiment was conducted in order to assess root architecture and functional traits amongst a panel of 23 maize genotypes across a gradient of P fertility (long term P fertilizer trial of INRA Auzeville near Toulouse SW France). Four P levels were tested, from P0 (treatment without P fertilizer since 1969) to P4 (treatment with rates of P fertilizer application between 3- and 4-fold the offtake by crops). Rhizosphere (soil adhering to roots) and bulk soil were destructively sampled at the 6-8 leaves stage when P deficiency was clearly visible in many genotypes in the P0 treatment. We measured the substrate-Induced respiration with the MicroRespTM technique (3 substrates and a proxy of microbial biomass) and basal respiration of the 350 soil samples from the topsoils of the two extreme P treatments (P0 and P4). Our first data analysis shows a positive P effect on microbial biomass and a significant interaction of phosphorus/type of soil effect (bulk/rhizosphere). No maize genotype effect was evident from the analysis. In general, P fertilization (P4 versus P0) seemed to have increased the differences in microbial parameters between rhizosphere and bulk soils. Acknowledgement: This research was part of the EURoot project, which received funding from the European Community Seventh Framework Programme FP7-KBBE-2011-5 under grant agreement no.289300.
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Dates et versions

hal-01268842 , version 1 (04-02-2016)

Identifiants

  • HAL Id : hal-01268842 , version 1
  • PRODINRA : 280842

Citer

Annette A. Berard, Line Capowiez, Ghislain Sevenier, Claude Doussan, Philippe Hinsinger. Microbial biomass and catabolic activities in the rhizosphere as impacted by P fertilization, a field study. PSP5 2014 - Facing Phosphorus Scarcity, Aug 2014, Montpellier, France. 2014. ⟨hal-01268842⟩
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