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Roots need air as well as water and nutrients in order to grow. Lawns, Especially those that receive heavy use, can develop compacted, air-deficient soil. Compact soil also restricts the absorption of water as well as air. Correcting compacted soil is described as aeration. Aeration allows metal tubes 1/4 to 3/4 inch in diameter are pushed into the soil, by machine, to a depth of 3 to 4 inches, sometimes deeper. The soil should be moist when this is done not too wet and not too dry.
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