Definition:
Sheet composting is the technique of spreading organic materials over a garden before they have thoroughly decomposed, then tilling them under to achieve subsequent decomposition. Those who haven’t the time to manage a compost bin, in which organic materials can be decomposed thoroughly, sometimes employ the technique of sheet composting.
If you're interested in sheet composting, you may also be interested in the following resources:
Examples:
I had just opened up some land and wanted to suppress weeds -- quickly -- while amending the soil simultaneously with the organic matter I had on hand; the solution for me was sheet composting.
