Most commercially produced growing media are composed of a combination of one or more components, such as sphagnum peat moss, perlite or pumice type materials, coir, bark or wood products, vermiculite and other materials, to produce distinct physical properties that will provide the plant with the best possible air porosity and water holding capacity for greenhouse plant production. In this brief article, Troy Buechel of PRO-MIX explores the basics of what air porosity is and why it is important for the production of healthy plants.
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