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Aeration and fertilization is good, but you generally want to improve the quality of the soil underneath. What's important for grass is the root system, and most people rely too much on the symptoms without getting to the problem.
If your soil is too high in clay, you will not have healthy grass. You need to have what's called "loam" underneath (40% silt, 40% sand, and 20% clay). This way, the roots with be able to breathe, but the soil will still be absorbent. But if you're stuck with poor soil and can't do much about it, be sure to apply topsoil, compost, and fertilizer annually.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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