Selective-herbicidal compositions, characterized in that they contain an effective amount of from 1 gram to 1 kilogram of a sodium salt of flucarbazone (i.e. 2-2-trifluoromethoxy-phenylsulphonyl-aminocarbonyl)-4-methyl-5-methoxy-2,4-dihydro-3H-1,2,4-triazol-3-one) of the formula (I) per hectare of soil surface and a surfactant.