5% Ag ricul tural determent EC i s a kind under of low toxici ty, heig eref fectier, broad- spect rum herbicide, po st- emerg ence a pplicatio n i t perfo rms selectiv eef fectiv eness on w eed killing . To g ramineous weeds the effectiv eness of co nt rol in abov e95% . The ef fect o f cont rol to la tifo lia te w eeds a nd sedg e familly w eeds is hig her than85% . On seeding so ybean in no n- ti llage wheat stubblefield, only one time o f w eedcont rol is necessary. The do sage o f 675ml per ha and evening , applica tion cause o nlyslight soybea n injury a nd become recovered 7 days af ter, yield increase was aro und 5-10% . This herbicide do es not cause po llutio n, w eed co ntrol ling effectiv eness persistsa ro und 40 days, on redinteg ratio n ef fect hig h sasety , and far use.