| 摘要 |
PCT No. PCT/GB86/00076 Sec. 371 Date Oct. 3, 1986 Sec. 102(e) Date Oct. 3, 1986 PCT Filed Feb. 12, 1986 PCT Pub. No. WO86/04772 PCT Pub. Date Aug. 28, 1986.In a seed drill having tractor wheel track eradicators (13), coulters (1) that sow rows of seeds along the line of the tractor wheel tracks (T), and tramlining means (4,5) that serves to stop the supply of seed to said coulters (1) to form tramlines on selected bouts; said track eradicators (13) are lifted out of work when sowing a bout with tramlines so that the tractor wheel tracks (T) remain and form a mark along the unsown rows. Preferably, said coulters (1) are also lifted out of work with the track eradicators (13) so as to avoid disturbing the tractor wheel tracks unduly.
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