Why your compost might be hiding persistent herbicide residues
In short: Small traces of certain weedkillers can linger in compost, potentially damaging your crops even when laboratory tests come back negative. This video demonstrates a practical bio-assay method to detect these hidden chemicals using simple seedlings.
The video explores the presence of persistent products like aminopyralid and clopyralid in compost. Because active compound levels are often so minuscule, standard lab tests may fail to identify them as hazards. To counter this, Charles Dowding advocates for a bio-assay: growing bean and pea seedlings to observe physical damage firsthand.
These reports are used by the UK government every six months to monitor the 'stewardship' program required for aminopyralid licensing. The goal is to increase awareness of how these herbicides can affect vegetable gardens and fruit trees, even in small-scale domestic settings.
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Sources
- Summary by Intellect · source: Pyralid weedkillers in compost 2: amino- and clopyralid, effects and healing
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