I asked a couple of the turf managers I deal with since we don't do this ourselves, the course staff does it. Each answer was a little different, but generally it is a mixture of approx. 50% sand, 25% topsoil, 25% peat moss (for water retention to encourage germination. Several of the higher-end courses have a staff member go around every day with a gadget sort of like the 'plugging tool' you would use for planting bulbs, they remove a plug of soil around the affected area and fill it with a plug of grass taken from the edge of the course, or a 'grass nursery' they maintain for such a purpose. A scrap of 4" pipe with a handle seems to be the 'plug tool' of choice. I like the take a plug out, put a plug in idea best myself because it is fast and low maintenance. Best of luck.

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