The American Agriculturist, 7: 209 (1848)

Value of Peat Ashes as a Manure

Peat ashes, or those made of common turf, or sod, are of much greater value than is generally supposed; though the common practice of allowing the peat to burn until it becomes a heap of white or reddish ashes, is both wasteful and erroneous. The fire should be carefully attended to by starting it first with a few dry sticks, weeds, or straw, and then adding fresh dried peat, or sod, so that the heap is only slightly charred, which completely decomposes the acids present, and the whole will be converted into a most useful manure.