Summary
This laboratory study demonstrates the optimisation of solid-state fermentation parameters to valorise green waste into dual-function biostimulant and biopesticide products. Using response surface methodology, the authors identified substrate composition trade-offs: higher tryptophan and grass content favoured IAA production whilst lower levels favoured spore formation. The optimised conditions (0.45% tryptophan, 61% grass, 74% moisture) suggest a practical pathway for converting landscape and garden waste into value-added biological inputs, though the study does not report field validation or agronomic efficacy.
UK applicability
Given the UK's substantial green waste stream from horticulture and landscaping, this approach could support circular economy principles in agricultural input production. However, field-scale validation of the biostimulant and biopesticide efficacy under UK growing conditions would be required before practical adoption.
Key measures
Indole-3-acetic acid (IAA) concentration, microbial spore count, substrate composition (tryptophan percentage, grass percentage, moisture content), fermentation duration (days)
Outcomes reported
The study optimised substrate formulation and fermentation duration to produce indole-3-acetic acid (IAA) and microbial spores concurrently from green waste. Maximum IAA production occurred at day 3 whilst maximum spore production occurred at day 7, with identified trade-offs between the two outputs across different substrate compositions.
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