Joined: Oct 2010
Posts: 407
wood ash
11/25/2018 at 7:28 PM
Wood ash tends to be quite alkaline, so it raises pH when added to soil. It makes soil less acidic, not more. Wood Ash. Adding wood ash raises pH, but it also adds much-needed nutrients to the soil. Wood ash contains potash, phosphate, iron, manganese, boron, copper and zinc in levels that vary depending on what type of wood the ash came from.