Cover crops shape the soil bacterial community in a tropical soil under no-till

Autor(es)

Ferreira Leite, Hugo Mota ^[1] ; Calonego, Juliano Carlos ^[2] ; Rosolem, Ciro Antonio ^[2] ; Mendes, Lucas William ^[3] ; de Moraes, Leonardo Nazario ^[4] ; Tommasini Grotto, Rejane Maria ^[4] ; Araujo, Fabio Fernando ^[5] ; de Araujo Pereira, Arthur Prudencio ^[6] ; Maciel Melo, Vania Maria ^[7] ; Ferreira Araujo, Ademir Sergio ^[8]

Afiliação do(s) autor(es)

^[1] Univ Fed Acre, Cruzeiro Do Sul - Brazil

^[2] Sao Paulo State Univ, Coll Agr Sci, Dept Crop Sci, Botucatu, SP - Brazil

^[3] Univ Sao Paulo, Ctr Nucl Energy Agr, Piracicaba, SP - Brazil

^[4] Sao Paulo State Univ, Coll Agr Sci, Dept Bioproc & Biotechnol, Botucatu, SP - Brazil

^[5] Univ Oeste Paulista, Presidente Prudente, SP - Brazil

^[6] Univ Fed Ceara, Dept Ciencia Solo, Fortaleza, Ceara - Brazil

^[7] Univ Fed Ceara, Lab Ecol Microbiana & Biotecnol, Fortaleza, Ceara - Brazil

^[8] Univ Fed Piaui, Agr Sci Ctr, Soil Qual Lab, Teresina, PI - Brazil

• Tipo de documento: Artigo Científico
• Fonte: APPLIED SOIL ECOLOGY; v. 168, DEC 2021.
• Citações Web of Science: 0

Resumo

The introduction of cover crops in tropical cropping systems under no-till (NT) is paramount for improving the chemical and physical properties of the soil as well as the sustainability of the system. Soil carbon is increased under cover crops, and the soil microbiota is undoubtedly modified. However, the effects of different cover crops on the abundance and structure of the soil bacterial community remain unclear. Therefore, this study used 16S rRNA sequencing to assess the abundance and structure of the bacterial community in a crop rotation system under NT using the following cover crop species: pearl millet (Pennisetum glaucum), grain sorghum (Sorghum bicolor), and Sunn hemp (Crotalaria juncea). For comparison, one additional treatment was kept under bare fallow. Soil samples were collected to a depth of 10 cm to assess the bacterial community. Redundancy analysis (RDA) showed that the bacterial community was correlated with microbial biomass N under millet, ammonium under Sunn hemp, and soil base saturation and P under sorghum and fallow. The most abundant phyla were Actinobacteria, Proteobacteria, and Chlorof iexi under millet, Chlorof iexi and Latescibacteria under Sunn hemp, and Proteobacteria and Patescibacteria under sorghum. Co-occurrence network analysis showed that the complexity of the bacterial community was highest under millet, followed by fallow, Sunn hemp, and sorghum. In summary, this study shows that cover crop species specifically shape microbial community structure and networks, with changes in the abundance of bacterial groups related to soil quality and health. (AU)

• Processo FAPESP: 15/50305-8 - A virtual joint centre to deliver enhanced nitrogen use efficiency via an integrated soil-plant systems approach for the UK & Brazil
• Beneficiário: Ciro Antonio Rosolem
• Modalidade de apoio: Auxílio à Pesquisa - Temático