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Webster 1913 Edition

Noun.

The act of process of applying manure; also, the manure applied.

ppr.

Dressing or overspreading land with manure; fertilizing.

Noun.

A dressing or spread of manure on land.

manuring

manuring ‎(plural manurings)

An application of manure.
- 2008, Helen Warner, Florida Fruits and How to Raise Them (page 97)
  When the clay is five or six feet or more below the surface, so that manures are liable to be washed down below the roots, three or four light manurings, one in January, another in March, another in June, and the last in August, are better than one or two heavy manurings.