---
kind: "section"
citation: "7 C.F.R. § 205.602"
title: "7"
number: "205.602"
heading: "Nonsynthetic substances prohibited for use in organic crop production."
url: "https://uscodex.org/cfr/7/205.602"
---

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


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).**

## Notes

### Amendments

[68 FR 61992, Oct. 31, 2003, as amended at 83 FR 66572, Dec. 27, 2018]

### Authority

Authority: 7 U.S.C. 6501-6524.

### Source

Source: 65 FR 80637, Dec. 21, 2000, unless otherwise noted.

### Amendments

[68 FR 61992, Oct. 31, 2003, as amended at 83 FR 66572, Dec. 27, 2018]