Core aerification with hollow tines is the best cultivation for existing turf.

• A. Core aerification with hollow tines
• B. Solid-tine aeration
• C. Chemical aeration
• D. No cultivation

Answer: (A)

Core aerification with hollow tines works best for established turf because it directly relieves soil compaction and creates meaningful channels for air, water, and roots to penetrate to deeper layers. Removing the soil cores not only reduces surface compaction but also loosens the root zone, enhances drainage, and stimulates microbial activity, which helps organic matter break down and root systems grow stronger. The holes left behind serve as inviting pathways for subsequent watering and rooting, and the decomposing cores add organic matter back into the soil. In contrast, solid-tine aeration only pokes holes without removing cores, so compacted material can be redistributed around the holes and long-term improvements are limited. Chemical aeration or no cultivation don’t physically loosen the soil or improve drainage and rooting to the same extent.