Generic Materials Search: wood ash

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Wood Ash
Allowed
Crop Fertilizers and Soil Amendments
Nonsynthetic
Wood ash must be produced exclusively from untreated and unpainted wood. Wood stove ashes must not be generated from burning of colored paper, plastic, or other prohibited materials. Excessive applications of ash can cause pH and nutrient imbalances. See ASH – PLANT OR ANIMAL.
205.203(d)(4) Ash obtained from the burning of plant material.