Translations:Benutzer:Arian/Klett-Mini-Test/876/en

be carried out any longer. In the 1950s and 60s, the rotary tiller stepped into the place of the skim plough for a time. It was to be the great deliverer. A shaft fitted with chopping blades rotates, driven by the power take-off, strikes into the soil, throws it into turbulence and lays it down magnificently mixed. The grave attendant drawbacks — formation of a smear pan, sealing of earthworm channels, chopping up of earthworms, loss of tilth through silting under heavy rain, high wear and energy demand — prompted its rapid disappearance, except in horticulture. Other power-take-off-driven implements, fitted for instance with forward-loosening shares, met with only limited success as well. The current practices form a diverse variation of soil-loosening stubble-cultivation implements with, for the most part, a moderate mixing effect. Closest to the skim plough comes the disc harrow, at a cultivation depth of approximately 5 cm. It carries the drawback that it cuts through and distributes the rhizomes of couch grass and thereby contributes to its spread. This drawback the narrow-share, many-tined cultivator makes good, in that it tears the rhizomes loose and lifts them upward, so that they can more readily be harrowed out. Its great drawback, however, is that it mixes insufficiently and does not cut completely beneath the tilth-layer. Against thistle and dock it can do little. Cultivators with appropriate combinations of implements can bring remedy here.