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Finnish Study Finds Glyphosate Residue in Manure Decreases Plant Growth

Scientists at the University of Turku, in Finland, found that when poultry manure with glyphosate residue is applied to plants, their growth is decreased. In testing, both meadow fescue and strawberries showed less growth, and strawberries put out fewer runners, when fertilized with manure from quails that were fed with feed containing glyphosate. The researchers suggest that higher levels of glyphosate are applied to glyphosate-tolerant crops, which can lead to higher levels of glyphosate residue in animal feeds made from those crops. This, in turn, leads to higher glyphosate levels in the animal manure, which has an effect on plants in fields where this manure is used as fertilizer. The researchers also identified indirect effects stemming from field application of glyphosate-contaminated manure.