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Want to supercharge your summer salads? Then it’s time to upgrade your produce picks. Tomatoes grown using organic fertilisation and organic pest-control techniques contained 55% more vitamin C than conventionally grown tomatoes, a new Brazilian study found. Plus, the organically grown tomatoes housed 139% more disease-fighting antioxidant phenols. Organic farming can subject crops to more stressful growing conditions, which may boost their natural defences and antioxidant stockpiles, the researchers say.