Which soil amendment would most benefit a soil compaction problem?

Which soil amendment would most benefit a soil compaction problem?

• A. Ground limestone
• B. Organic matter
• C. Granular fertilizer
• D. Fine sand

Answer: (B)

Relieving soil compaction comes from improving the soil’s structure so air, water, and roots can move more easily through it. Organic matter does this by helping soil particles clump together into stable aggregates. Those aggregates create a mix of larger and smaller pores, which lowers bulk density, enhances drainage in compacted soils, and makes the soil easier to work. As organic matter breaks down, microbial activity helps maintain that looser structure over time, providing lasting relief from compaction and better root growth. Ground limestone changes chemistry and adds calcium but doesn’t change the physical structure of the soil. A granular fertilizer supplies nutrients, not a lasting change in how the soil holds or moves air and water. Fine sand, especially when mixed into many soils, can clog pore spaces and actually worsen compaction rather than alleviate it.

Relieving soil compaction comes from improving the soil’s structure so air, water, and roots can move more easily through it. Organic matter does this by helping soil particles clump together into stable aggregates. Those aggregates create a mix of larger and smaller pores, which lowers bulk density, enhances drainage in compacted soils, and makes the soil easier to work. As organic matter breaks down, microbial activity helps maintain that looser structure over time, providing lasting relief from compaction and better root growth.

Ground limestone changes chemistry and adds calcium but doesn’t change the physical structure of the soil. A granular fertilizer supplies nutrients, not a lasting change in how the soil holds or moves air and water. Fine sand, especially when mixed into many soils, can clog pore spaces and actually worsen compaction rather than alleviate it.