Answer: In general, it is best not to use raw manure on leafy green vegetables that will be harvested 60 days or less prior to application. The National Organic Standards requires a 120 day window for application of raw manure to harvest time.
Composting the manure is an option that makes the manure safer to handle, and provides a more stable nutrient source. If the manure that you use comes with bedding, the correct Carbon to Nitrogen ratio would exist for developing compost on your farm. A great deal of information on composting is available through our Farm-Scale Composting Resource List.
The ATTRA publication Manures for Organic Crop Production discusses specific procedures required by the National Organic Program, and gives in-depth safe manure handling recommendations, as well.
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