Organic matter is an important soil material. It consists of raw and partially decayed plant and animal residues.
Organic matter binds soil particles, granules, and aggregates together.
It aids water penetration and aeration of plant roots in clayey soils and increases moisture holding capacity of sandy soils. It also adds some nutrients for plants and microorganisms. Organic matter in soil can be depleted or used up. Continued soil productivity depends upon replenishment and maintenance of organic matter. Homeowners who know of the importance of organic matter in their soil try to replace it whenever possible.