Section 205.602 - Nonsynthetic substances prohibited for use in organic crop productionThe following nonsynthetic substances may not be used in organic crop production:
(a) Ash from manure burning.(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.(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.(j) Tobacco dust (nicotine sulfate).68 FR 61992, Oct. 31, 2003, as amended at 83 FR 66572, Dec. 27, 2018