A book I'm reading on creating hotbeds recommends mixing "short litter" with the fresh manure as the base of the beds. I've also seen websites recommending using grass cuttings or a good short litter as mulch. What materials are short litter in these contexts and is there any preparation required to make them into short litter?
In the context in this book, short litter is a carbonaceous composting material used to slow the heating of the manure in hotbeds. This would include shredded leaves, cut straw, wood chips, old grass clippings, etc.. It can also mean animal bedding mucked out before it it becomes very soiled, especially for chickens.