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Discs harrows are the most commonly used tillage implements in Portugal. A review of available information shows that the forward speed effect in draught requirements of trailed disc harrows is not clear. This paper gives the results of field trials with trailed disc harrows, performed in the field in different soils. The results show that draught force tends to increase with forward speed and that this relationship is almost linear at speeds between 3 and 9 km/h.
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Serrano et al. (2008) studied this question.
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