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The grass could be dying because it’s overwatered or underwater. Additional issues include over-mowing the lawn, compacted soil, or a fungal disease in the lawn. In many instances, regular maintenance can keep grass from dying.

The screwdriver test involves trying to push a screwdriver into your lawn. If it goes in easily, you’re likely overwatering and should cut back. If there’s moderate resistance, you have a good watering schedule and soil composition. If there’s a lot of resistance or you can’t get the screwdriver into the soil, you may need to aerate your lawn to reduce compaction and increase your watering schedule.

Aeration can level your lawn if the issue is minor soil compaction, so it can help smooth things out if your yard is bumpy from foot traffic or vehicle traffic. However, it won’t slope your yard. If you have small areas where water seems to pool after precipitation, aeration could help, but larger issues with improperly sloped lawns and problems leading to foundation leaks or structural damage will require more comprehensive solutions.

There are several possible reasons why your Bermuda grass is not thick, with the biggest reasons being too little water, too much shade, compacted soil, drainage issues, and too few nutrients in the soil. Bermuda grass needs frequent and direct sunlight to stay thick, so thinning grass is likely the result of a lack of sun.