Compost is rich in nutrients. It is used in gardens, landscaping, horticulture, and agriculture. The compost itself is beneficial for the land in many ways, including as a soil conditioner, a fertilizer to add vital humic acids, and as a natural pesticide for soil. Compost can be made of a variety of materials, including using worms to generate worm castings. This is called vermiculture. In ecosystems, compost is useful for erosion control, land and stream reclamation, wetland construction, and as landfill cover.