Organic matter can improve soil structure lightening heavy soils and increasing the water holding capacity of sandy soils. Composted materials make good mulches that can be used to inhibit weeds and cool soils. Takes some labor. Access to raw materials is needed. The compost pile is kept moist but not too wet.
Air is able to penetrate to the center of the pile.
Materials should be selected that promote the growth of the microbes responsible for composting and contain the nutrients needed by plants. It is also a good idea to include a source high in nitrogen such as bedding from a horse stall or poultry manure. Kitchen wastes can be composted but meats and dairy products should be avoided. Compost only small items, no big branches, etc. Try to select materials that won't create a mat blocking air and water.