Top Dressing
Top dressing is the mechanical action of adding biomas, nutrients and protection to the surface of your lawn. This material is then agitated so that it sinks down to sit on the soil or thatch layer. Typical materials for over dressing are topsoil, compost, peat, or sand, or a combination of those to get the desired results. Top dressing with compost and sand, or sand and peat, is common after core aeration or overseeding.