Compost builds sound root structure. Compost makes clay soils airy so they drain. Compost gives sandy soils body to hold moisture. Compost attracts and feeds earthworms. Compost reduces water demands of plants and trees.
Compost helps control soil erosion.
Compost reduces plant stress from drought and freezes. Compost can extend the growing season. Compost improves vitamin and mineral content in food grown in compost-rich soils. Compost generously applied replaces reliance upon petrochemical fertilizers. There are many environmental side effects from the use of petrochemical fertilizers.