Compost may be used as a soil conditioner. As a soil amendment, it improves the soil's physical structure and fertility. Compost makes heavy clay soils easier to work and improves aeration, root penetration, and water infiltration. Addition of compost to sandy soils improves water and nutrient retention. Although compost contains some nutrients, it should not be considered a fertilizer. In most cases, additional fertilization will be necessary to achieve maximum plant growth and production. Nevertheless, the humus in compost will increase the efficiency of fertilizer applications. Compost makes a good mulching material, and can be used around both garden and landscape plants. It can also be used as a growing medium for houseplants or, once pasteurized, for starting seeds.
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