Solarization is accomplished by spreading moist media to a depth of 6 to 10 inches on a clean surface. The pile or row is then covered with clear plastic sheets with the edges sealed to the surface to prevent the loss of heat and moisture. Back To Top Media Physical Properties Media physical properties may be determined using simple laboratory methods. Media samples can be analyzed by commercial laboratories or you can make the physical measurements yourself using simple tools. The general method is described at the NCSU Porometer .
Media weight is kind of a double edged sword.
Ideally growers would like a heavy mix when containers are on the ground in an outdoor nursery to minimize blow-over, but during plant movement and shipping, a lightweight mix is desired. A nursery media that uses a significant percentage of mineral soil will have a dry bulk density of 40 to 50 ft3. Ideally the total volume of empty pores should be in the range of 50 to 70 percent. This is referred to as total porosity . Both components are critical for good plant growth, but not enough of either can limit growth.