Thatch is a layer of partially decomposed grass; it is on top of the soil and below the blades of grass. It is a natural development of healthy, vigorous turf, but layers greater than ½ inch can cause problems. An excessive layer of thatch will inhibit root growth deeper into the soil which limits access to water as well as other nutrients.One of the main practices for reducing thatch is aeration. Aeration removes less thatch directly but speeds up decomposition by bringing soil and thatch directly into contact. Aeration also helps to reduce soil compaction and increase water and nutrient saturation as well as helps to stimulate root development. If you have heavy clay soil or clay loam soil regular aeration is necessary to prevent your soil from becoming compacted.
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