Soybeans treated preemergence with carboxyl-labeled C14 amiben (3-amino-2,5-dichlorobenzoic acid) were harvested at 7-day intervals. The C14 activity per gram of dry plant matter decreased with later harvest dates but the activity per plant increased over the period. The cotyledons had considerable radioactivity. Both rates contained the same amount of C14 amiben but the soybeans exposed to 6 lb/A contained a significantly higher C14 count than did those exposed to 3 lb/A. All of the identifiable C14 components were amiben.

Most of the activity in soybeans from seed imbibed with C14 amiben remained in the cotyledons. That which did translocate was evenly distributed. Most (98.1%) of the radioactivity in plants grown in treated nutrient solution remained in the roots. Translocated C14 amiben appeared about 8 days after exposure and was evenly distributed in the top of the plant. Plant-respired CO2 had no radioactivity present.