Is wood ash from burned up plywood & OSB safe for the garden?

Meadowlark

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I absolutely would not use it in my veggie garden. The materials used to make them often contain adhesives, resins, and chemicals that can release harmful substances when burned. The resulting ash may contain toxins that can negatively impact your soil and plants.

Natural wood ash is the only wood ash I will use. It normally tests out @ potassium (K) ~5%, calcium (Ca) ~25%, phosphorous (P) ~2%, and magnesium (Mg) ~1%

Of course, unless you have a soil test, it is very easy to apply wood ash in excess creating soil imbalances that can lead to significant problems. For example, potassium toxicity can interfere with the uptake of other crucial nutrients, particularly calcium and magnesium, leading to plant deficiencies.

Likewise, excess phosphorus can disrupt the photosynthetic process in plants, hindering their ability to convert sunlight into usable energy. This can result in diminished growth, chlorosis, and overall reduced vigor in garden plants.

Soil imbalances are often very difficult and time consuming to overcome.
 

Oliver Buckle

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I've looked at it, thought about it, and chucked it out as something I can stand on until it breaks up, then I chuck it in the bin, and I don't like chucking anything in the bin if there is any way I feel I can recycle it.
 

gary350

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I have always been afraid to put OSB & Plywood ash in my garden.

I have a good size pile of wood scraps that I need to burn. It is about 50% plywood and OSB. The other 50% is tree limbs.

Soon as we stop having 25 mph gusty wind I will burn the tree limbs first and save it for the garden, plants that get BER need the calcium. When I burn the OSB & Plywood I will pour the ash on the far size of the yard in a fence row.
 

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