Decaying organic matter can build up on the immediate surface of the turf, especially when the clippings are returned to the surface. This produces a thick impermeable layer that reduces the air, water and nutrient intake into the soil, subsequently producing a weak sward which may be prone to the following;
- Germination of moss spores
- Introduction to fungal diseases
- Introduction of weed seeds, particularly in the summer
- Spread of unwanted grass seed