The effect of residual corn herbicides on injury and yield of soybean seeded in the same season

Soltani, N., Mashhadi, R. H., Mesgaran, M. B., Cowbrough, M., Tardif, F. J., Chandler, K., Swanton, C. J. and Sikkema, P. H. 2011. The effect of residual corn herbicides on soybean injury and yield seeded in the same season. Can. J. Plant Sci. 91: 571-576. In rare situations, poor stands of corn are removed and reseeded to soybean later in the spring, even though residual corn herbicides have already been applied. Nine field studies were conducted over a 3-yr period (2005 to 2007) at four locations in Ontario, Canada, to determine the minimum interval for re-seeding to soybean following the application of residual corn herbicides. Five commonly used residual corn herbicide premixes or tankmixes were applied 6, 4, 2 or 0 wk before soybean seeding. The level of injury generally increased as the interval between herbicide application and soybean seeding decreased. Isoxaflutole plus atrazine caused as much as 28% injury and decreased plant stand, biomass and yield as much as 7, 49 and 42%, respectively. S-met...