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ARTICLE IN PRESS Biosystems Engineering (2006) 95 (1), 35–41 doi: 10.1016/j.biosystemseng.2006.06.007 PM—Power and Machinery Assessment of the Behaviour of Potatoes in a Cup-belt Planter 1,2 1 3 1,4 H. Buitenwerf ; W.B. Hoogmoed ; P. Lerink ; J. Muller¨ 1Farm Technology Group, Wageningen University, P.O Box. 17, 6700 AA Wageningen, The Netherlands; e-mail of corresponding author: willem.hoogmoed@wur.nl 2Krone GmbH, Heinrich-Krone Strasse 10, 48480 Spelle, Germany 3IB-Lerink, Laan van Moerkerken 85, 3271AJ Mijnsheerenland, The Netherlands 4Institute of Agricultural Engineering, University of Hohenheim, D-70593 Stuttgart, Germany (Received 27 May 2005; accepted in revised form 20 June 2006; published online 2 August 2006) The functioning of most potato planters is based on transport and placement of the seed potatoes by a cup- belt. The capacity of this process is rather low when planting accuracy has to stay at acceptable levels. The main limitations are set by the speed of the cup-belt and the number and positioning of the cups. It was hypothesised that the inaccuracy in planting distance, that is the deviation from uniform planting distances, mainly is created by the construction of the cup-belt planter. To determine the origin of the deviations in uniformity of placement of the potatoes a theoretical model was built. The model calculates the time interval between each successive potato touching the ground. Referring to the results of the model, two hypotheses were posed, one with respect to the effect of belt speed, and o