Nonsynthetic substances prohibited for use in organic crop production
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
The following nonsynthetic substances may not be used in organic crop production:
(a) Ash from manure burning.
(b) Arsenic.
(c) Calcium chloride, brine process is natural and prohibited for use except as a foliar spray to treat a physiological disorder associated with calcium uptake.
(d) Lead salts.
(e) Potassium chloride—unless derived from a mined source and applied in a manner that minimizes chloride accumulation in the soil.
(f) Rotenone (CAS # 83-79-4).
(g) Sodium fluoaluminate (mined).
(h) Sodium nitrate—unless use is restricted to no more than 20% of the crop's total nitrogen requirement; use in spirulina production is unrestricted until October 21, 2005.
(i) Strychnine.
(j) Tobacco dust (nicotine sulfate).
[68 FR 61992, Oct. 31, 2003, as amended at 83 FR 66572, Dec. 27, 2018]
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.