Abstract
An empirical model was developed using multiple regression to describe the relationship between measured values of relative saturation, macropore volume, and soil moisture content in a Charlottetown fine sandy loam, an Orthic Humo-Ferric Podzol (Cryorthod). The model was used to characterize the incidence of root rot severity in spring cereals, under a mouldboard ploughed and direct drilled tillage system. As soil macropore volume decreased from 14.5 to 8.5% (v/v) root rot severity increased from 50 to 72%. This was associated with an increase in relative saturation from 60 to 74%. The results illustrate the interaction between soil structure and root disease under humid soil moisture regimes.
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