I apologize for this delayed reply to your gardening question and hope it is still helpful to you.
It is generally best to use a light textured soil next for filling in low areas this would mean us a sand or sandy loam soil. If you only apply an inch or so each time the grass will grow up through it fairly quickly. Avoid using compost only, or heavy clay soils when you are filling in low areas.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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