Summary
This field trial examined how intercropping and mulching affect lettuce productivity and rhizosphere microbiota in Styria, Austria over three cropping cycles. Intercropping increased lettuce biomass at early and late stages compared to monoculture, whilst mulching consistently enhanced biomass, though mulched systems showed greater yield losses under extreme weather. Rhizosphere microbial profiling revealed contrasting effects: bacterial alpha diversity increased significantly in intercropped systems (with enrichment of plant growth-promoting genera like Pseudomonas and Bacillus), whilst fungal diversity was reduced by mulching and intercropping, with potential pathogens more prevalent in unmulched monocultures.
UK applicability
The study's Austrian temperate climate and lettuce production systems are reasonably comparable to UK horticultural conditions. However, findings on extreme weather impacts on mulched systems warrant validation in UK-specific climatic contexts, and adoption would depend on labour availability and economics of intercropping management in commercial UK horticulture.
Key measures
Lettuce fresh weight at early and late growth stages; soil parameters; bacterial alpha diversity (16S rRNA gene amplicon sequencing); fungal diversity (ITS region amplicon sequencing); rhizosphere bacterial and fungal community composition; enriched/depleted microbial genera by treatment
Outcomes reported
The study measured lettuce fresh weight biomass, soil parameters, and rhizosphere microbial community composition (bacteria and fungi) across three cropping cycles under four production systems. It assessed how intercropping and mulching practices modulated crop performance and soil microbiota diversity and structure.
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