Which type of soil amendment increases organic capacity?

Compost is regarded as an effective soil amendment for increasing organic capacity due to its rich organic matter content. When added to soil, compost enhances the microbial population, improves soil structure, and increases the nutrient-holding capacity. This boost in organic matter helps retain moisture and nutrients, supports root development, and promotes overall soil health.

In addition to its capacity to improve nutrient availability, compost enhances the soil's ability to support diverse plant life. It aids in creating a more balanced soil ecosystem that fosters plant growth while also improving drainage and aeration characteristics. These attributes make it particularly beneficial in both garden and landscaping contexts, ensuring a sustainable environment for plants to thrive.

While sand, lime, and clay serve essential roles in soil amendment practices, they do not primarily enhance organic capacity. Sand can improve drainage but does not contribute to organic matter. Lime helps adjust soil pH levels, while clay can enhance nutrient retention and water-holding capacity but may lead to compaction if not managed properly. Thus, compost stands out as the best option for increasing organic capacity.