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Can I use my non-organic neighbor’s manure on my organic field?
It is not required to use manure from organic livestock on organic fields. If you are growing livestock feed, ornamentals, or fiber, then you can apply manure at any time on your organic cropland.
Feed and bedding: Arsenic is the only prohibited feed input that could have been fed to non-organic animals, which would prohibit use of manure on organic land. Arsenic has at times been added to conventional broiler chicken feed. It is an element, and will remain in your soil since it does not break down. You must document that this is not in the feed if you are using broiler manure. Other than this, animals could have been fed genetically engineered (GE) feed, or given antibiotics or hormones, and the manure is still allowed on organic land.
However, if the manure includes bedding, it cannot contain prohibited synthetics, like treated wood shavings or glues/paints/heavy metal-based inks. On the other hand, GE corn stalks, or any conventionally raised crop is allowed as bedding in manure that can then be spread on organic land.
Piles and Lagoons: You must obtain a document from the manure supplier that a manure pile or manure lagoon did not have prohibited synthetic items used in or on the manure. For example, no non-approved fly sprays or herbicides may be used on manure piles, or non-approved synthetics put in manure lagoons to control odor. A natural lactobacillus bacterium is allowed as a manure lagoon additive, as long as it does not contain non-approved synthetics. Manure that has been piled outside or in a barn for 10 years with no turning and/or no documentation that it reached the high temperatures required for compost (see below) is still considered raw manure, and can only be used according to the manure restrictions on human consumed crops.
Human-consumed crops: If you are growing crops for human consumption, and the manure is not composted or processed, the manure must be incorporated either 120 days before harvest of the crops where the crop has contact with soil (either growing in or on the ground, or where rain might splash soil on the crop, such as beets, tomatoes, peppers), or wait 90 days before harvest where the crop does not have contact with soil (i.e. corn or soybean seed).
Compost and processed manure: Manure that has been composted (documented temperature of over 131 degrees for 15 days and turned 5 times) or processed (150-165 degrees for one hour and tested to have less than 1000 most probable number (MPN) of fecal coliform and 3 MPN salmonella per 4 gram sample) can be used up until day of harvest with no restriction. If you are composting only vegetative matter, without any animal by-products, then there is no requirement to track the compost reaching a specific temperature. Non-animal product compost can be spread on your organic crops at any time.
Using manure: Be aware that raw manure that has not reached the high temperatures of composting or processing will contain viable weed seeds. You will be adding more, and possibly different, weed seeds to your fields. It is a good idea to obtain an analysis of the manure you are using so you can better manage for the nutrients it provides.
Posted: Jan 2012
Answer By: Harriet Behar