1) Rubbish; later, associated closely with manure.
I have found no examples of this word in any of the major reference works but it occurred quite commonly in the West Riding from the sixteenth century. A Doncaster court roll has several references and the general sense is implicit in the following: 1572 The said Inquest giveth warning to all them that have any fulter heap, clogg, clay heaps or heaps of stone lying in the street that they be conveyed away. Examples in later centuries link the word more closely with ‘manure’: 1685 to lay … all the hay, straw, fulture, manure and compost which he should yearly grow, breed and have upon the premises … where most need should be for the manuring and bettering of the same, Austby
1772 hay, corn, straw, fulture, compost, dung, ashes, Holmfirth. One possibility is that it developed locally via ‘foldure’ in connection with the practice of folding or enclosing animals so as to secure the manure that they produced. The fulture would be a mix of manure and bedding. Alternative spellings include funter in Woodsome, and foolture in Holmfirth.