(n.) (1) A layer of dead plant material on the soil surface. cf. fresh and humic mulch. (2) An artificial layer of material such as paper or plastic on the soil surface. (v.) Cultural practice of placing rock, straw, asphalt, plastic or other material on the soil's surface as a surface cover.
Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.