Abstract
There was significant difference between the two separation devices of lifters machines in their effects on all the studied properties with better results obtained by the locally designed lifter than the chain (Algerian) one. Also there was significant difference of the effect of relative speed at the property of undamaged tubers only the better results obtained was 1.15 relative speed. significant differences showed between different ground speeds of the lifting operation on property of undamaged tubers and slightly damaged tubers only, the better results obtained was 1.5 km/h, forward speed. Also there were significant differences on the effect of the interaction between type of separating device and relative speeds on all studied properties. The locally lifter gave a better results at relative speed of 1.38 for all the properties except for the quantitative loss, which showed better results obtained by use of the locally lifter at the two relative speed of 1.38 & 1.15 together.
