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Written by Megan Lynch (she/her) on 2025-02-02 at 07:54

"As a Source of Potassium. If the soil is acid (below pH 6.0), wood ashes can be used as a source of potassium. Assuming there is 6 percent K2O in ashes, 1 ton/A. (50 lb./1000 sq. ft.) will provide 120 lb./A. of K2O (2.8 lb./1000 sq. ft.). This is adequate for most gardens, lawns, & shrubs. However, nitrogen and phosphate fertilizers may still be needed. Continued use of ashes on the same site or at high rates could raise the soil pH too high—particularly in sandy soils"

https://www.aces.edu/blog/topics/lawn-garden/wood-ashes-for-lime-and-potash/

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Written by Megan Lynch (she/her) on 2025-02-02 at 07:54

Not the best approach for large scale agriculture, but possibly actionable for small farms.

Luckily there's more wood ash around in winter.

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