ABSTRACT DRYING characteristics of wheat, barley, and canola (rapeseed) were investigated in a thin layer dryer. Samples of naturally moist grain were dried in the dryer with 70 C air and then cooled to the room temperature. The dried grain was then rewetted to its initial moisture, and was held for 1.5 to 2 days. The reconstituted moist grain was dried again. This procedure was repeated five times. Seed density and bulk porosity of each sample were measured before and after wetting and drying cycles. Seed density decreased while bulk porosity increased, indicating an irreversible swelling of grain as a result of multiple wetting and drying. To compare drying characteristics, the constants in drying equation MR = exp(Kt^) were estimated by the experimental data. Using this equation drying rates of naturally moist and reconstituted grain were compared. Wheat and barley did not show any trend in predicted drying rate while canola showed a decreasing drying rate. The largest difference in drying rate was between drying naturally moist and the subsequent rewetted grain.