The objective of this work was to determine the best condi ons for the water immersion test and to evaluate its e ciency for applica on on rice seeds. Five seed lots of cv. rice IRGA 417 were used, which were submited to immersion treatments tests for periods of 24, 48, 72, 96 and 120 hours at 25 C. After treatments, germina on test, par al and total length of seedlings and seedlings dry mater were accomplished...