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Distribution of soil fractions and location of soil bacteria in a vertisol under cultivation and perennial grass IRD
Kabir, M.; Chotte, Jean-Luc; Rahman, M.; Bally, R.; Jocteur Monrozier, L..
Effects of soil management on soil characteristics were investigated on the rhizosphere (RPP) and the non-rhizosphere (NRPP) siol of a re-grass vertisol under #Digitaria decumbens$ and in the soil under continuous cultivation (CC). A low energy technique allowed to separate eight size and density fractions, including macro- and micro-aggregates while preserving soil bacteria. Organic C and N, microbial biomass C and the number of total bacteria (AODC) and of #Azospirillum brasilense$ and their distribution were determined in soil fractions isolated from the CC, NRPP and RPP soils. Soil macroaggregates (>2000 micrometers) were similarly predomminant in the NRPP and RPP soils when the dispersible clay size fraction (<2 micrometers) represented more...
Tipo: Text Palavras-chave: BIOLOGIE DU SOL; BACTERIE; NUMERATION; VERTISOL; BIOMASSE; HERBACEE; DENSITE DE POPULATION; AGREGAT.
Ano: 1994 URL: http://www.documentation.ird.fr/hor/fdi:010013328
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Isolation and identification of the most efficient plant growth-promoting bacteria associated with canola (Brassica napus) Inra
Bertrand, H.; Nalin, R.; Bally, R.; Cleyet-Marel, J.C..
Thirteen of the most abundant Gram-negative bacteria which are able to grow in N-depleted culture conditions were isolated from the rhizoplane and endorhizosphere of canola (Brassica napus) and identified by 16S rDNA sequence analysis. Eight of these bacteria induced a significant increase in root dry weight ranging from 11 to 52%. Phylogenetic positioning based on 16S rDNA sequences indicated that at least four genera are represented, Pseudomonas, Variovorax, Agrobacterium and Phyllobacterium. The most important direct plant growth-promoting-rhizobacteria effect was found with both isolates belonging to the Phyllobacterium.
Tipo: Journal Article Palavras-chave: BRASSICA NAPUS; ASSOCIATION; BACTERIE GRAM NEGATIF; SEQUENCE NUCLEOTIDIQUE; PROMOTEUR DE CROISSANCE; RHIZOBACTERIE; PHYLLOBACTERIUM; CANOLA.
Ano: 2001 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0200029473089902&uri=/notices/prodinra1/2010/12/
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