Which is an example of a soil amendment?

• A. Compost
• B. Pesticide
• C. Gravel
• D. Mulch

Answer: (A)

A soil amendment is material added to soil to improve its properties, such as fertility, structure, and water-holding capacity. Compost fits this idea because it is decomposed organic matter that, when mixed into soil, increases the amount of organic matter, adds nutrients, and boosts beneficial soil microbes. This improve in soil tilth helps roots grow more easily, enhances moisture retention in drier soils, and can improve drainage in heavier soils. Pesticide is used to control pests, not to improve soil properties. Gravel is an inert material that changes drainage but does not supply nutrients or biology. Mulch is usually applied on the surface to conserve moisture and regulate temperature rather than being mixed into the soil to improve its properties. So compost is the clear example of a soil amendment.