Soil amendments are materials that are added to soil to improve its physical, chemical, or biological properties. These amendments can help to correct nutrient deficiencies, improve soil structure, increase water retention, and boost microbial activity in the soil. Common soil amendments include compost, manure, lime, and gypsum. They are often used in agriculture, horticulture, and landscaping to improve soil fertility and overall plant health. Soil amendments can also play a role in reducing environmental pollution and promoting sustainable agricultural practices.