agricultural environmental material agricultural potting mixture http://orcid.org/0000-0002-3410-4655 An agricultural environmental material which 1) is composed of a mixture of materials such as peat, composted bark, sand, perlite, or compost, and 2) serves as a medium in which to grow plants. potting soil Potting soil can be composed of a wide range of materials in varying ratios, often containing little or no actual soil.