What is the primary purpose of soil aeration?

• A. Repair divots
• B. Increase the oxygen in the soil
• C. Increase soil compaction
• D. Reduce the amount of fertilizer

Answer: (B)

Introducing air into the soil to raise oxygen levels is the main purpose of aeration. Roots need oxygen to respire and fuel growth, and many beneficial soil microbes rely on aerobic (oxygen-using) conditions to break down organic matter and release nutrients. When soil is compacted or has little air space, oxygen becomes limited, roots struggle to grow, and nutrient uptake drops. Aeration creates and enlarges air channels, improving root health, drainage, and overall soil biology. It isn’t about repairing divots, increasing compaction, or reducing fertilizer—those aren’t the goals of soil aeration, even though better-oxygened soil can help nutrients be used more efficiently.