| 摘要 |
<p>Plastic seed drill consisting of the combination of a distributor 2, 3 having interchangeable discs 5 and of a drilling wheel having drilling tips 9, 10 of variable number mounted on two concentric rings 6a, 7. The plastic seed drill as a whole is carried by one or two wheels 21, 21a adjusting the depth of penetration of the drilling tips into the ground. <IMAGE></p> |
