Poplars are noted for their extremely rapid rates of growth. The development of new canker-and rust-resistant clones in Belgium and their introduction into Britain make them a very attractive crop to grow on suitable sites, such as former agricultural land. New tables are needed to reflect the more rapid rates of growth seen at spacings which are current practice. In this Technical Paper we give tables for spacings of 8 m x 8 m, 4 m x 4 m and 3 m x 3 m. The range of yield classes is extended to Yield Class 26. These tables only represent three out of a wide range of planting spacings for which models could be constructed. The systematic thinning treatments proposed in the models for 3 m and 4 m planting spacing were chosen on the assumption that an early return from a thinning treatment, that could be simply applied, would be a preferred management option. This publication is still available to order in hardcopy.