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Here are documentations which you can find the list of all material that you can and you can not use in organic agriculture:
Materials List and Information
Organic farming is based on using natural methods for building soil fertility and managing insects, weeds, and disease. Most
synthetic materials are prohibited. The National Organic Program (NOP) allows the use of all natural substances (materials) unless
they are specifically prohibited (e.g. strychnine and nicotine are prohibited). Under the NOP all synthetic substances (materials) are
prohibited unless they are approved on the National List.
Washington State organic growers have several sources for determining what materials are allowed in organic production: the
National List, the WSDA 2006 Brand Name Materials Lists (BNML) and the Organic Materials Review Institute (OMRI) website.
The WSDA Brand Name Materials List is a list of brand name products that have been evaluated to determine that they comply with
organic standards. Products listed on the BNML are for use in organic production.
Materials Lists and Information
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