Abstract
Poplars and willows are fast-growing trees that can be effectively grown as a renewable energy source. This study was devoted to the preliminary screening of poplar and willow clones for biofuel application in a fast-growing tree nursery established in the M.M. Gryshko National Botanical Garden of the National Academy of Sciences of Ukraine. The nursery includes 19 Populus and 10 Salix clones, with many hybrids of Ukrainian origin. The clones were assessed in the first two years in the nursery using growth parameters, biomass fuel criteria, and susceptibility to pathogens. Using total rank for evaluation, the highest rank was found in the poplar clone “Kanadska × balsamichna” followed by the clones “Ivantiivska”, “Volosystoplidna”, “Perspektyvna”, and “Nocturn”. Among the willows, the highest rank was recorded for the clone “Zhytomyrska-1”, followed by clone “Zhytomyrska-2”. High ranks were also found in the poplars “Strilopodibna”, “Mobilna”, “Novoberlinska-7” and “Keliberdynska”, and the willows “Lisova pisnya” and “Vinnytska”. Thus, the above-mentioned clones may be recommended as promising trees, though they should be further evaluated under field conditions for growth performance within the short-rotation cycles. The clones with the lowest total rank were poplars “Bolle”, “Gradizka” and “Kytaiska × piramidalna” and willows “Lukash”, “Olimpiisky vohon” and “Pryberezhna” are not recommended for bioenergy short-rotation plantations. Evaluation of plants in the nursery allowed us to carry out rapid and cost-effective preliminary screening. Such multiclonal screening of bioenergy trees for planting in short rotations was described for the first time in Ukraine.
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