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Scarifying/De-Thatching:

This beneficial culitivation practice helps to improve the availability of air, water and nutrients which improve root growth and turf density.
Thatch is the accumulation of dead or decaying leaf and root matter, found just below the surface of the grass. Excessive amounts of thatch in sports turf may affect the characteristics of the playing surface. A build-up of thatch can be the result of poorly aerated soil, over-watering, excessive fertilizer or an accumulation of grass clippings.
Scarifying is the mechanical removal of thatch from the turf, while verticutting is the control of thatch build-up by vertical mowing.