Which benefit of composting contributes most to soil health?

Introducing beneficial organisms is the most significant benefit of composting that contributes to soil health. Compost is rich in microorganisms such as bacteria, fungi, and a variety of beneficial organisms including earthworms and nematodes. These organisms play a critical role in the soil ecosystem by breaking down organic matter, which enhances the nutrient content and improves soil structure.

The presence of these beneficial organisms in compost helps to promote a diverse soil biome, which is essential for healthy plant growth. They enhance nutrient cycling, improve soil aeration, and promote the formation of aggregates, which are crucial for water retention and root development. Furthermore, these organisms can also help in suppressing soil-borne diseases, thereby providing an additional layer of protection to plants.

While the other options present valid points related to composting, they do not directly impact soil health to the same extent. For example, reducing landfill waste is an environmental benefit that helps decrease the amount of organic material in landfills but is not directly associated with the soil's physical or biological properties. Replacing chemical fertilizers can lead to positive changes in soil, yet the primary improvement in soil health comes from the active biological processes initiated by beneficial organisms. Enhancing crop yields, while an important outcome, is ultimately dependent on the underlying health