Everything about Organic Matter totally explained
Organic matter (or
organic material) is
matter that has come from a recently living organism; is capable of decay, or the product of decay; or is composed of
organic compounds. The definition of organic matter varies upon the subject it's being used for.
Soil organic matter
Soil is mainly composed of minerals and organic matter, like decaying plants and animals, as well as living organisms. The minerals are derived from the weathering of "parent material" - bedrock and overlying sub-soil. The organic matter in soil derives from plants and animals. In a forest, for example, leaf litter and woody material falls to the forest floor. This is sometimes referred to as organic material.
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) When it decays to the point it's no longer recognizable it's called soil organic matter. When the organic matter has broken down into a stable humic substances that resist further decomposition it's called
humus. Thus soil organic matter comprises all of the organic matter in the soil exclusive of the undecayed material.
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Once living matter
Organic matter may refer to matter which was once part of a living organism or produced by a living organism. This definition is synonymous with
biotic material, and would include a clam's shell and naturally produced
urea, while excluding synthetically produced urea. While this definition is useful for modeling nutrient flows, it isn't useful in measuring the organic content of soil.
Decay
Organic matter may be defined as material that's capable of decay, or the product of decay (
humus), or both. Usually the matter will be the remains of recently living organisms, and may also include still-living organisms. Polymers and plastics, although they may be
organic compounds, are usually not considered organic material, due to their poor ability to decompose. A clam's shell, while
biotic, wouldn't be considered organic matter by this definition because of its inability to decay.
Organic chemistry
Measurements of organic matter generally measure only
organic compounds or
carbon, and so are only an approximation of the level of once-living or decomposed matter. Some definitions of organic matter likewise only consider "organic matter" to refer to only the carbon content, or
organic compounds, and don't consider the origins or decomposition of the matter. In this sense, not all organic compounds are created by living organisms, and living organisms don't only leave behind organic material. A clam's shell, for example, while
biotic, doesn't contain much
organic carbon, so may not be considered organic matter in this sense. Conversely,
urea is one of many organic compounds that can be synthesized without any biological activity.
Vitalism
The equation of "organic" with living organisms comes from the now-abandoned idea of
vitalism that attributed a special force to life that alone could create organic substances. This idea was first questioned after the
abiotic synthesis of urea by
Friedrich Wöhler in 1828.
Further Information
Get more info on 'Organic Matter'.
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