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A Model for Determining Spatial Distribution of Soil-borne Propagules. Mary L. McCoy, Research Associate, Department of Agronomic Crop Science, Oregon State University, Corvallis 97331; Robert L. Powelson, Associate Professor, Department of Botany and Plant Pathology, Oregon State University, Corvallis 97331. Phytopathology 64:145-147. DOI: 10.1094/Phyto-64-145.

Propagules that are uniformly distributed in a soil system can be represented by tetrahedra with the apices representing the propagules. If the tetrahedra are arranged to form a perfect lattice, a cubic close-packed lattice will result. Using this model, the distance (D) between propagules in the soil can be estimated from the equation: D = 1.1225 3√ V_s/N where (V_s) represents the volume of the soil and (N) the number of propagules or inoculum density.