Pesticide and metabolite residue mixtures in subtropical agroecosystem soils: The inconvenient truth.
Shah SS, Silva V, van Dam J, Singh A, Osman R
Summary
PubMedWhy it matters This matters because the vegetables, fruits, and grains grown in these soils — including sugarcane and orchard crops — are absorbing a cocktail of pesticides and their breakdown products that current safety regulations largely ignore.
Scientists tested soil from 70 locations in northern India and found pesticide pollution virtually everywhere — even on organic farms and in forests. What's alarming is that the chemical leftovers from pesticide breakdown were often more concentrated than the original pesticides, and they were found deep in the soil, not just at the surface. Up to 24 different chemicals were found at a single site, and 80% of locations posed a high risk to earthworms, which are essential for healthy soil.
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A sweeping study of Indian farmland soils found pesticide contamination in nearly every site tested, including organic farms and forests. Toxic chemical mixtures are seeping deeper into the soil than previously measured, posing serious risks to earthworms and broader soil ecosystems.
Key Findings
98.6% of surface soil samples were contaminated with pesticide residues, including sites under organic management and forest reference areas.
Pesticide metabolites (breakdown products) frequently exceeded their parent compound levels, with fipronil, neonicotinoid, atrazine, and DDT metabolites among the most common — suggesting persistent, underestimated risks.
80% of sites showed high theoretical risk to earthworms, with sugarcane and orchard systems being the most hazardous land uses.
Abstract Preview
The presence and accumulation of multiple pesticide residues in soil threaten biodiversity and soil health, yet depth-resolved evidence on pesticide-metabolite mixtures in subtropical agroecosystem...
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