Generic Materials Search: wood ash
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Crop Fertilizers and Soil AmendmentsNonsynthetic
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.