Light tillage is not always the best suited. Indeed, for some crops, like potatoes, it is important to create relatively fine soil to a relatively large depth (about 20-25cm). In this case robust tine machines are able to prepare the soil in a minimum of passes.
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TopDown by Väderstad is the perfect machine in this case. Combined with the deep work of its strong tines, front disks are used to shred the residue from the previous crop and thus work in a single pass. These leveling disks and a rear roller leave perfectly level and regular soil.