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No, it's not a good idea to put grass seed directly on top of dead grass. For successful germination and growth, grass seed needs good soil contact. To prepare the area, start by removing the dead grass using a shovel or a sod cutter. Then, loosen the soil, add soil amendments if necessary, and spread the grass seed evenly. This allows the seed to come into direct contact with the soil, promoting better germination and establishing a healthier lawn.

A lawn that suddenly and quickly turns yellow is typically the result of a dramatic change in the grass's environment. Heavy rainfall can dilute soil nutrients, rapidly yellowing the grass, and dull lawn mower blades can dry out and damage the grass in a short time. Over-fertilizing can yellow a lawn within a matter of days. 

Strange as it may seem, poking holes in your lawn can do a great deal to help the grass grow back stronger, thicker, and happier. By allowing light, water, and nutrients to penetrate the soil, the grass can root down deeper and get more of what it needs to thrive. All of which is to say, if you care about the appearance of your lawn, yes, lawn aeration is usually worth the money—especially since it’s not that expensive.

Common tools include spike aerators and core aerators. Professionals often use motorized equipment for efficiency.