What is the benefit of using compost-based topdressing compared to sand-only topdressing in turf renovation?

• A. Compost adds organic matter and nutrients, improves soil structure and microbial activity, but should be well-composted and applied in moderate amounts to avoid weed contamination.
• B. Sand-only improves soil structure better than compost.
• C. Compost is cheaper and always better with no caveats.
• D. Compost lowers microbial activity.

Answer: (A)

Compost-based topdressing strengthens the soil by introducing organic matter and nutrients, which improve soil structure and foster a thriving microbial community. The organic matter helps particles bind into stable aggregates, increasing porosity, water-holding capacity, and root space, all of which support better turf establishment after renovation. The nutrients in well-matured compost are released gradually as microbes break it down, providing a steady, available supply that supports growth without a sudden spike. It’s essential to use well-composted material because immature or contaminated compost can bring weed seeds, excess salts, or phytotoxic compounds and may lead to problems in the seedbed; applying it in moderate amounts helps avoid weed contamination and nutrient imbalances. In contrast, sand-only topdressing mainly changes surface texture and drainage but doesn’t contribute organic matter or boost soil biology and fertility to the same extent.