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

FERNANDEZ-GNECCO, GABRIELA; SMALLA, KORNELIA; MACCARIO, LORRIE; SØRENSEN, SØREN J; BARBIERI, PABLO; CONSOLO, VERONICA F; COVACEVICH, FERNANDA; BABIN, DOREEN

FEMS MICROBIOLOGY ECOLOGY

WILEY-BLACKWELL PUBLISHING, INC

Año: 2021

0168-6496

Soil microbial communities are key players of ecosystem processes and important for29 crop and soil health. The Humid Pampas region in Argentina concentrates 75% of the national30 soybean production, which is based on intensive use of agrochemicals, monocropping and31 no-till. A long-term field experiment under no-till management in the southeast of the32 Argentinean Pampas provides a unique opportunity to compare soybean under monocropping33 with cultivation including alternating cover crops or in a three-phase rotation. We hypothesized34 that cropping regimes and season affect soil microbial community composition and diversity.35 Amplicon sequencing of 16S rRNA genes and internal transcribed spacer fragments showed36 a stronger microbial seasonal dynamic in conservation regimes compared to monocropping.37 In addition, several bacterial (e.g. Catenulispora, Streptomyces and Bacillus) and fungal38 genera (e.g. Exophiala) with cropping regime-dependent differential relative abundances were39 identified. Despite a temporal shift in microbial and chemical parameters, this study shows40 that long-term cropping regimes shaped the soil microbiota. This might have important41 implications for soil quality and soybean performance and should therefore be considered in42 the development of sustainable agricultural managements.