Summary
This field-based study examined how organic management practices, specifically manure amendment, shaped soil microbial communities in olive orchards compared with conventional systems. Organically managed soils exhibited significantly elevated nutrient concentrations, higher predicted bacterial capacity for pollutant degradation and pathogen defence, and more complex, interconnected microbial networks characterised by shorter pathway distances. The findings suggest that manure amendment represents an effective strategy for enhancing soil microbial community structure and function in olive agroecosystems.
UK applicability
Olive cultivation is not a mainstream UK agricultural practice due to climate constraints, limiting direct relevance. However, the principles regarding manure amendment's role in enhancing soil microbiota, nutrient cycling, and microbial resilience may be applicable to UK organic fruit and horticulture systems, though crop-specific validation would be necessary.
Key measures
Soil nutrient content (oxidable organic matter, total nitrogen, nitrate, phosphorus, potassium, sulfate); bacterial community composition and predicted metabolic functions (pollutant degradation, pathogen defence); microbial co-occurrence network metrics (positive interactions, complexity, geodesic distance)
Outcomes reported
The study compared soil microbial communities, nutrient content, and microbial metabolic functions between organically managed (with manure amendment) and conventionally managed olive orchards. It measured soil nutrient concentrations, predicted bacterial metabolic capabilities, and analysed microbial co-occurrence network structure.
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