Sod is the upper layer of turf that is harvested for transplanting. Turf consists of a variable thickness of a soil medium that supports a community of turfgrasses.[1]
In British and Australian English, sod is more commonly known as turf, and the word "sod" is limited mainly to agricultural senses.
^Turgeon, Alfred J.; Kaminiski, John E. (2019). Turfgrass management (Edition 1.0 ed.). State College, Pennsylvania: Turfpath. ISBN978-1-7332881-0-1.