Particulate organic matter

Particulate organic matter (POM, macroorganic matter, or coarse fraction organic matter) is defined as soil organic matter between 0.053 mm and 2 mm in size. Isolated by sieving, this fraction includes partially decomposed soil detritus and plant material, pollen, and other materials. Consistent sieving is important when determining POM content because isolated size fractions will depend on the force of agitation