Which of the following is not listed as a factor affecting thatch buildup?

• A. The turf species
• B. Over-fertilization
• C. Soil texture
• D. Improper pH

Answer: (C)

Thatch buildup is driven by how the turfgrass grows and how its residues decompose, influenced by the choice of turf species, how fertility is managed, and the soil environment that supports microbial breakdown. Some grasses tend to produce more thatch because of their growth habit, so the turf species factor matters because it changes how much litter and living tissue accumulate near the soil surface.

Over-fertilization, especially with nitrogen, pushes rapid shoot growth and more clippings, which adds to the layer of organic matter that becomes thatch. When there’s too much nitrogen, decomposition can’t keep up with production, leading to a thicker thatch layer.

Improper pH affects the microbial community and the availability of nutrients needed for organisms that break down thatch. If the pH is out of the ideal range, microbial activity slows or shifts, reducing thatch breakdown and allowing buildup to accumulate.

Soil texture, while it does influence drainage, aeration, and moisture retention, is not typically listed as a direct factor contributing to thatch buildup in standard turf management guidance.