Timing of atrazine application for control of quackgrass (Agropyron repens)

application date application foliaire application methods application rates atrazina atrazine automne autumn chemical control crop yield date de traitement dose d'application elymus repens escarda fecha de tratamiento foliar application glycine max herbicidas herbicide herbicides lutte chimique ontario primavera printemps rendement des cultures rendimiento de cultivos residues residuos soil treatment split applications spraying spring traitement du sol tratamiento del suelo treatment date weed control