Why top dress the greens after scarifying and coring?
The purpose of this process is to remove thatch and organic matter and introduce new soil to the soil profile assisting in drainage through the surface.
How much top dressing should you put on?
You should only put on enough top dressing to fill the core holes and smooth the surface, this should be able to be brushed into the canopy with no top dressing remaining on the surface.
Here is an interesting article about top dressing from the North Carolina State University.
Refining Your Putting Green Topdressing Program
by Dr. Rich Cooper, Dept. of Crop Science, NC State University
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