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Limited information on likely supply and spatial yield of bioenergy crops exists for the UK. Here, productivities are reported of poplar (Populus spp.) and willow (Salix spp.) grown as short‐rotation coppice (SRC), using data from a large 49‐site yield trial network.

A partial least‐squares regression technique was used to upscale actual field trial observations across England and Wales. Spatial productivity was then assessed under different land‐use scenarios.

Mean modelled yields ranged between 4.9 and 10.7 oven‐dry tonnes (odt) ha⁻¹ yr⁻¹. Yields were generally higher in willow than in poplar, reflecting the susceptibility of older poplar genotypes to rust and their tendency for single stem dominance. Replacing 10% of arable land, 20% of improved grassland and 100% of set‐aside grassland in England and Wales with the three most productive genotypes would yield 13 Modt of biomass annually …