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adderall effects on the brain Asked about the lengthened time frame, FDA spokeswoman Juli Ann Putnam replied with the following statement: "The majority of the research the FDA consulted showed that most intestinal pathogens of public health importance, under the most common conditions, would not survive in the soil past one year. Survival studies showed that organisms most commonly associated with fresh produce outbreaks (such as E. coli, salmonella and listeria) are unlikely to survive at detectable levels in soil past 270 days. Therefore, we tentatively concluded that a nine-month waiting period between the application of untreated biological soil amendment of animal origin and the harvest of the produce would be recommended." The FDA noted that there's no waiting period for compost used in soil that does not contact produce.