A stump jump tyne assembly (11) comprising a tyne support (13), a tyne (15) and a biasing spring (17). The tyne support (13) is mounted to an agricultural implement and the tyne (15) is pendently mounted to the tyne support for engaging the ground. The spring (17) biases the tyne (15) towards a ground engaging position. The tyne support (13) is provided with a track (29) and the tyne (15) is provided with a carriage (34) having a pair of rollers (37) on either side to move along the track. When the tyne (15) is in the ground engaging position, the track and carriage arrangement enables the tyne to move rearwardly and upwardly relative to the tyne support (13) upon encountering an obstacle whilst maintaining the relative angular disposition of the tyne (15) relative to the ground for substantially the duration of its engagement with the ground. The rear of the track (29) has a recess along its upper surface to accommodate posterior rollers (37a) enabling the tyne to change its angular disposition relative to the ground when clear of the ground thereby enabling the tyne to clear the obstacle. The tyne (15) is provided with a shank (103) having an acuate anterior edge (107), and a detachable point (105) having a truncated nose (113) and marginal depressed edges (109a) and (109b).
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