Biological amendments are substances added to soil to enhance its fertility and health. These amendments often contain beneficial microorganisms, such as bacteria and fungi, which help break down organic matter and improve nutrient availability. They can also promote plant growth by enhancing root development and increasing resistance to diseases. Common types of biological amendments include compost, biochar, and mycorrhizal fungi. These materials not only enrich the soil but also support a diverse ecosystem, which is essential for sustainable agriculture. By improving soil structure and function, biological amendments contribute to better crop yields and environmental health.