97%以上。 The mechanism of cutting corn stalk and rootstalks by using two kinds of discs in a soil bin have been experimentally studied in order to investigate the performance of cutting off corn stalk and rootstalks. The soil bin experiments demonstrated that when the rotational speed of the discs was 350r/min, running speed was 0.65m/s and there were corn stalk and rootstalk on the soil surface, the power consumption of the tooth-disc was 0.45 times of the disc, more than 97 percent of corn stalks and rootstalks on the row were cut off when the rotational speed of the disc was higher than 350r/min, namely the velocity of cutting straw was higher than 7.4m/s. The tooth-disc has the capability to treat the corn residue.