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Microbial community analysis of soils under different soybean cropping regimes in the Argentinean south-eastern Humid Pampas

GND
1229247165
Affiliation
Julius Kühn-Institute (JKI), Institute for Epidemiology and Pathogen Diagnostics, Germany ; Instituto de Investigaciones en Biodiversidad y Biotecnologıa, CONICET- Fundacion para Investigaciones Biologicas Aplicadas (INBIOTEC, CONICET-FIBA), Argentina ; Instituto Nacional de Tecnologıa Agropecuaria, Estacion Experimental Agropecuaria Balcarce - CONICET (INTA, EEA Balcarce - CONICET), Argentina
Fernandez-Gnecco, Gabriela;
GND
1058967878
Affiliation
Julius Kühn-Institute (JKI), Institute for Epidemiology and Pathogen Diagnostics, Germany
Smalla, Kornelia;
Affiliation
University of Copenhagen, Department of Biology, Section of Microbiology, Denmark
Maccario, Lorrie;
Affiliation
University of Copenhagen, Department of Biology, Section of Microbiology, Denmark
Sørensen, Søren J.;
Affiliation
Instituto Nacional de Tecnologıa Agropecuaria, Estacion Experimental Agropecuaria Balcarce - CONICET (INTA, EEA Balcarce - CONICET), Argentina
Barbieri, Pablo;
Affiliation
Instituto de Investigaciones en Biodiversidad y Biotecnologıa, CONICET- Fundacion para Investigaciones Biologicas Aplicadas (INBIOTEC, CONICET-FIBA), Argentina
Consolo, Veronica F.;
Affiliation
Instituto de Investigaciones en Biodiversidad y Biotecnologıa, CONICET- Fundacion para Investigaciones Biologicas Aplicadas (INBIOTEC, CONICET-FIBA), Argentina ; Instituto Nacional de Tecnologıa Agropecuaria, Estacion Experimental Agropecuaria Balcarce - CONICET (INTA, EEA Balcarce - CONICET), Argentina
Covacevich, Fernanda;
GND
1014430453
Affiliation
Julius Kühn-Institute (JKI), Institute for Epidemiology and Pathogen Diagnostics, Germany
Babin, Doreen

Soil microbial communities are key players of ecosystem processes and important for crop and soil health. The Humid Pampas region in Argentina concentrates 75% of the national soybean production, which is based on intensive use of agrochemicals, monocropping and no-till. A long-term field experiment under no-till management in the southeast of the Argentinean Pampas provides a unique opportunity to compare soybean under monocropping with cultivation including alternating cover crops or in a three-phase rotation. We hypothesized that cropping regimes and season affect soil microbial community composition and diversity. Amplicon sequencing of 16S rRNA genes and internal transcribed spacer fragments showed a stronger microbial seasonal dynamic in conservation regimes compared to monocropping. In addition, several bacterial (e.g. Catenulispora, Streptomyces and Bacillus) and fungal genera (e.g. Exophiala) with cropping regime-dependent differential relative abundances were identified. Despite a temporal shift in microbial and chemical parameters, this study shows that long-term cropping regimes shaped the soil microbiota. This might have important implications for soil quality and soybean performance and should therefore be considered in the development of sustainable agricultural managements.

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