Water absorption curves were developed for air dry peat-vermiculite and pine bark media. Data indicated 70-78% of moisture saturation was attained within 5 days with a peatvermiculite medium while 48 days were required to achieve 58-70% saturation with a milled pine bark medium. Increased water absorption of pine bark after 10 days of wetting suggested that a threshold moisture level within the bark particles is necessary if water uptake is to be enhanced. The threshold moisture content was established at 35% (wet wt basis).
Received for publication January 11, 1978. Conducted under Hatch project 411, University of Georgia College of Agriculture Experiment Stations, College Station, Athens. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.
Graduate Student, Assistant and Associate Professors, respectively. This is a portion of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree in Plant Science. Present address: Dept. of Plant and Soil Science, Univ. of Mass., Amherst, MA 01002.