What is thatch layer?

Some articles on thatch layer, layers:

Sand-based Athletic Fields - Aeration and Topdressing For Proper Thatch Management
... Aeration on a sand-based system is used more to control the thickness of the thatch layer than to relieve compaction ... A thick thatch layer on a sand-based athletic field can be detrimental ... These layers prevent essential nutrients and water from reaching the plant ...

Famous quotes containing the word layer:

    The writer in me can look as far as an African-American woman and stop. Often that writer looks through the African-American woman. Race is a layer of being, but not a culmination.
    Thylias Moss, African American poet. As quoted in the Wall Street Journal (May 12, 1994)