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.
通式为:##STR1## 其中R.sup.1代表较低的烷基基团;而R.sup.2代表较低的烷基基团或较低的烷氧基团,或其盐。这些
尿素衍
生物是新颖的,并对各种杂草具有强烈的除草活性,并且对作物植物的植物毒性非常低。