In all test years, statistically significant differences occurred between different cultivators/ridgers at each of the measurement dates (in the period between ridging and harvest) (Table 3). The PTO-driven cultivator/ridger made ridges with the largest cross-sectional area (more than 950 cm2) when measured after the ridging in all three years. This resulted from the PTO-driven cultivator/ridger’s cultivation depth (15 cm), which was greater than that of the other two cultivators/ridgers (10 cm with the STC cultivator/ridger and 8 cm with the RTC cultivator/ridger) and cultivated a greater soil volume to be used for ridge shaping. Due to the rotating movement of its blades, soil treatment in the inter-row space was much more intensive than with the drawn cultivators/ridgers. The cross-sectional area of the ridge that the RTC cultivator/ridger made was the smallest. Gerighausen (1994) states that, at a 75 cm IRW, the cross-sectional area of the ridge after cultivation and ridging should be between 900 and 1,000 cm2. The RTC cultivator/ridger was not able to shape a ridge of this cross-sectional area on the medium textured soil used in the trial, since ridge discs were unable to cut deep enough into the soil to shape a high-enough ridge. This is also the reason why the RTC cultivator/ridger produced a statistically higher percentage of green tubers (Table 9). The cross-sectional area of the ridge made by the STC cultivator/ridger in 2003 was not large enough. However, this improved in 2004. With spring tines not reaching a sufficient depth and ridge heads not shaping a high-enough ridge, the cross-sectional area of the ridge was not large enough. The STC cultivator/ridger shaped sharply-pointed ridges of considerable height which did not allow