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The ClearStar CS 600 is a classic straw harrow. It is specifically designed for stubble cultivation, but can also partially combat weeds and volunteer grains or canola mechanically. This test protocol is part of the system comparison "Approach the Rapeseed Stubble: five devices compared". The additional protocols are also available as individual posts on www.topagrar.com/technik. Aggressiveness by choice On five consecutively arranged, round support tubes, a total of 100 spring tines are mounted on the 6m version. The distance between the tubes is 50cm. The tines are slid onto the tubes and triple twisted. The tine itself has two "material zones". It is softer at the top to prevent breakage during flexing. The steel at the bottom is hardened for low wear. The spacing of the 16mm thick and 75cm long tines is 6cm. The aggressiveness of the tines can be hydraulically adjusted. The tubes are connected to each other via a linkage, and they are rotated by hydraulic cylinders. The tines can be positioned either more upright for aggressive action or flatter for less aggressive action. The two rear rows of tines can be adjusted separately. For stubble cultivation, for example, in rapeseed, Saphir offers an optional impulse rail, similar to what is used with the knife roller. Low weight With a consumption of 1.9 liters of diesel per hectare, the consumption with the straw harrow was close to that of the knife roller. The tines were set quite aggressively as we wanted to produce fine soil. Saphir indicates an operating speed range between 12 and 25 km/h. In the test, we drove at a speed of 18 km/h, theoretically achieving 10.8 ha/h. It is important when using the straw harrow that the tines vibrate. A minimum driving speed of 12 km/h is required for this. The ClearStar also barely penetrates the ground. In the test, we could measure a maximum depth of 1-2 cm. Weighing 1,790 kg, it is the lightest machine compared to a 6m disc harrow. The use of the straw harrow is limited to post-harvest management.