A standard 1:1 v/v pine bark and sand potting medium was characterized physically by particle size distribution, bulk density (BD), total pore space, porosity at 50 cm H2O tension and porosity at >50 cm H2O tension. A potting medium identical to the standard was constructed from component milled pine bark and sand particles. Phaseolus lunatus L. ‘Jackson Wonder’ plants grown in the 2 physically similar media, under a standard cultural program, were essentially identical. Construction of a potting medium from a prescribed screen analysis provides a means to quantify variation which exists within a medium assumed to be uniform.
Former Graduate Student, Tavares, FL 32778.
Received for publication 1 Dec. 1983. Supported by State and Hatch funds allocated to the Georgia Experiment Stations. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.