Soil amendment is a practice that involves adding organic or inorganic materials to soil in order to improve its physical, chemical, and biological properties. This can include adding compost, manure, and other organic matter to increase soil fertility, as well as adding lime or sulfur to adjust pH levels. Soil amendments can also help improve soil structure, water retention, nutrient availability, and overall plant health. This practice is commonly used in agriculture and gardening to enhance plant growth and productivity.