There are several reasons why someone might top dress their lawn:
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To level out uneven patches in the lawn: Applying a thin layer of top dressing can help to fill in low spots and level out the surface of the lawn.
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To add nutrients to the soil: Top dressing materials such as compost or manure can help to enrich the soil and provide the grass with the nutrients it needs to thrive.
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To improve the soil structure: Top dressing can help to improve the structure of the soil, making it more porous and better able to retain moisture.
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To control weeds: Applying a layer of top dressing can help to smother weeds, reducing the need for chemical herbicides.
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To improve the appearance of the lawn: A top dressing of compost or other materials can help to give the lawn a more attractive and healthy appearance.