| 摘要 |
A double fertiliser hopper is mounted on a frame attachable to a tractor. Each hopper has an outlet (11) in its floor through which the fertiliser falls onto a rotary disc with radial vanes which spread the fertiliser over the soil surface. Each outlet is opened or closed by two pivoted slides (12,13), mounted one above the other. One slider can be fully opened or fully closedby a hydraulic cylinder (22) controlled by the tractor driver. The second slider is set at a fixed degree of opening before beginning to spread the fertiliser. The first slider is then fully closed and, when the tractor reaches the field to be spread, is fully opened.
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