Biomass Productivity of the selected willow varieties for short-rotation coppice in experimental plantations
Biomass productivity of 4 varieties of short-rotation willow coppice in the first two rotations (2 + 3 years) was analysed in 2 experimental plantations. It was demonstrated that site conditions had the greatest impact on woody biomass production. The average annual production of the analysed willow varieties in the first two rotations was 3.5 times greater than the production in the identical experiment with willows grown on sandy alluvial soils and very light alluvial soils containing loose sands in the subsoil. The average annual aboveground biomass production of Salix viminalis ‘ORM’ showing the best increment was 8.5 tonnes of dry biomass per hectare. In addition, the growth parameters of 10 willow varieties during two three-year rotation cycles were compared in two other experimental plantations. Under Polish natural conditions five of them can be recommended for short-rotation coppice production. These are: S. purpurea var. ‘Piaskówka’, clones S. viminalis: ‘Stipularis’, ‘Tenuifolia’ and ‘Reinfenwardii’ from the collection of Agricultural University in Poznań, as well as ‘ORM’ – a clone selected in Sweden to be grown in energy plantations.
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