2-amyl N-phenylcarbamate had the strongest herbicidal activity against Amaranthus retroflexus with an ECso of 6.6 mg/L.

• 特别是9号化合物，即2-戊基N-苯基氨基甲酸酯对反枝苋的杀草活性最强，其EC_(50)值为6.；6mg/L。