Using gorse compost as a peat-free growing substrate for organic strawberry production

Summary

This field trial evaluated compost made from gorse (Ulex europaeus), with and without poultry manure amendment, as a peat-free growing substrate for organic strawberry production. Whilst gorse composts showed acceptable physical and chemical properties with high nutrient concentrations, plants grown in these formulations exhibited lower nitrogen and chlorophyll levels than the peat-based control, though fruit yield and size were comparable. The authors concluded gorse compost could serve as an effective peat substitute for strawberry cultivation within a circular economy framework, though supplementary fertiliser at fruiting stage would be advisable to maintain optimal productivity.

Regional applicability

This Spanish trial provides relevant evidence for United Kingdom organic strawberry producers seeking peat-free alternatives, particularly in regions where gorse or similar woody green waste is available for composting. Nutrient release kinetics may differ under UK growing conditions and climate, and commercial viability would depend on local gorse availability and compost production infrastructure.

Key measures

Nutrient concentrations in substrate solution (nitrogen, potassium), plant chlorophyll levels, fruit size and yield, above-ground biomass, physical properties of compost formulations

Outcomes reported

The study evaluated gorse-based compost formulations as peat-free growing media for organic strawberry cultivation, measuring nutrient availability, plant growth, biomass accumulation, and fruit yield compared to a peat-based control. Nutrient concentrations in growing solutions and chlorophyll levels were tracked throughout crop development.

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