Summary
This narrative review synthesises evidence on crop allelopathy—the biochemical suppression of weeds via secondary metabolites—as a sustainable herbicide alternative. The authors examine multiple allelopathic crop species, discuss their demonstrated efficacy and mechanisms of action, and critically address the disconnect between laboratory and field evidence and current farmer uptake. The paper provides practical guidance for integrating allelopathic strategies into ecologically sound weed management systems, bridging research and practitioner knowledge.
Regional applicability
UK farmers operating organic or low-input systems may benefit from allelopathic crop integration for weed management, particularly in arable rotations. However, the variable climate, photoperiod and soil conditions in the UK may require region-specific adaptation of allelopathic strategies developed in Mediterranean or continental contexts.
Key measures
Allelopathic potency of crop species; mechanisms of phytotoxic compound release; weed suppression efficacy; adoption gaps between scientific evidence and farm practice
Outcomes reported
The review synthesises current evidence on allelopathic crops and their herbicidal mechanisms, identifying species with demonstrated weed-suppressive properties through secondary metabolite release. It also examines barriers to farmer adoption and outlines practical integration pathways for allelopathic strategies in weed management systems.
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