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This study examined the effects of auxiliary airflow on seed movement in the seeding tube of an air-seeding device. A vinyl tube 8–16 mm in diameter was connected to the seeding tube to study the effect of auxiliary tube diameter for a constant auxiliary pressure of 0.4 MPa. Then, the auxiliary pressure was varied from 0.2 to 0.4 MPa for a constant auxiliary tube diameter of 3 mm. We confirmed that the main airflow velocity increased by 10 m/s and the seed velocity increased by 2.8 m/s for an auxiliary air pressure of 0.4 MPa supplied by a 3-mm-diameter auxiliary tube. However, under this same condition, the seed angle of descent increased by 3.4°.