Answer: To pasteurize soil, it will take 30 minutes at 180 degrees F. The advantage of pasteurization can be lost if faulty sanitation allows the reintroduction of disease organisms. The following suggestions will help maintain soils in a disease-free condition: 1) sterilize all seedling soils at the same time. 2) disinfect benches, tables, pots, trays, etc., before dumping or using clean soil. Disinfect all tools that come into contact with clean soils. 3) do not transplant infected seedlings or plants from out-of-doors or from diseased trays into clean soil. 4) do not handle clean soil with dirty hands or tools. 5) keep the nozzle of watering hoses or cans off the soil at all times. You did not say whether the soil you used was actual garden soil or a sterile soil-less seedling mix.
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