| Abstract: | To improve efficiency of selection in first year clones, investigations were carried out on the use of two-plant plots instead of one-plant ones. Extended plot size did reduce the environmental variance of characters connected with tuber yield, but had only a slightly positive effect on the selection result, as was concluded from a comparison between the first and the second clonal generation. Only lowering selection pressure in the first year clones seems to be a solution for optimizing selection efficiency, as could be concluded by comparing simulated selection percentages of about 5%, 20% and 50%.Owing to genotype × harvest time-interaction for the majority of traits important to either seed or ware potatoes, assessments at both harvest times are necessary for proper evaluation. |
