Compost made with manure is questionable for use in food Gardens due to newer strains of bacteria that cause food-borne illnesses. The microorganisms that break down plant wastes require favorable temperatures, moisture and oxygen. Compost can be used as a soil amendment and a mulch. All yards produce waste from pruning, lawn mowing and other routine plant care activities. Composting is a way to reduce the volume of organic wastes and return them to the soil to benefit growing plants.
Organic matter improves the drainage and aeration of clay soil.
Composting helps sandy soil hold water and nutrients. It also increases the activity of earthworms and other natural soil organisms that are beneficial to plant growth. Compost is a soil amendment, not a fertilizer. It contains limited plant nutrients. Layering helps compost reach the correct nitrogen balance.