ABSTRACT DROPS in static pressure across columns of corn, sorghum, and wheat at various moisture contents were measured to determine the effect of grain moisture content at filling on resistance to airflow. Resistance to airflow decreased with increased grain moisture. The square of the correlation coefficient, R2, between the static pressure drops calculated by using a model and values measured experimentally were 0.99 for all grain tested. This means that the model fit very well with the experiment data. The result of this study enhances our knowledge about the effects of at-filling grain moisture content on the static pressure drop in grain and should help designers of high moisture-grain-aeration systems.