Herbicide

Herbicidally active alkyl N-phenylcarbamates are employed in combination with phenyl esters of N-alkylcarbamic acid or N,N-dialkylcarbamic acid. For example, a herbicidally active isopropyl N-phenylcarbamate is formulated in admixture with a phenyl N-methylcarbamate. The presence of the N-alkylcarbamate enhances the effectiveness of the N-phenylcarbamate as a herbicide by extending its soil persistence, increasing its herbicidal activity and/or altering its spectrum of practical herbicidal activity.