This would be the properest Manure for their Sandy Land, if they spread it not too thick, theirs being, as I have said, a shallow sandy Soil, which was the Reason I never advis'd any to use Lime, […] But as most Lands have one Swamp or another bordering on them, they may certainly get admirable Slitch, wherewith to manure all their Up-Lands.
DeBow's Review (James Dunwoody Brownson De Bow, Edwin Bell, 1858), volume 25, page 206, quotes this and glosses slitch as "marsh-mud"
Source: wiktionary
With respect to the mud and slitch, which must gather in a wet dock, both from the fresh of the river, and the sea flowing in, a reservoir of water is necessary to scour it away. […] Any of the other wet docks must be liable to have slitch and mud in them, […]
Source: wiktionary
Lime is chiefly used as a manure, with clagg or slitch, as the farmers call it, being the wreck left by the tide on the shore.
Source: wiktionary
The remainder of the essay is chiefly concerned with means of increasing fertility by the use of sea weed, leaves raked together by poor children, slitch carted from swamps, and sea salt.
Source: wiktionary
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