Urea derivatives of the general formula: ##STR1## wherein R.sup.1 stands for a lower alkly group; and R.sup.2 stands for a lower alkyl group or a lower alkoxy group, or a salt thereof, are novel and have a strong herbicidal activity against various species of weeds and shows a very low phytotoxicity to crop plants.
Urea derivatives of the general formula:
wherein R' stands for a lower alkyl group; and R2 stands for a lower alkyl group or a lower alkoxy group, or a salt thereof, are novel and have a strong herbicidal activity against various species of weeds and shows a very low phytotoxicity to crop plants.