Xtremehorticulture

Natural Substances Prohibited by USDA for use in Organic Crop Production

https://www.federalregister.gov/documents/2017/03/21/2017-05480/national-organic-program-usda-organic-regulations

§ 205.602 Nonsynthetic substances prohibited for use in organic crop production.

(a) Ash from manure burning.
(b) Arsenic.
(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) Sodium fluoaluminate (mined).
(h) Strychnine.
(i) Tobacco dust (nicotine sulfate).

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