Johnston, ChristopherWalsh, Linda R.E.McCracken, Alistair R.2022-02-232022-02-232021-11-24Johnston, C.R., Walsh, L.R. and McCracken, A.R. (2022) ‘Effect of two vs. three year harvest intervals on yields of Short Rotation Coppice (SRC) willow’, Biomass and Bioenergy. Elsevier BV. doi:10.1016/j.biombioe.2021.106300961-9534https://doi.org/10.1016/j.biombioe.2021.106303Published online: Accepted - 14 November 2021; Published online - 24 November 2021Five genotypes of Short Rotation Coppice (SRC) willow: ‘Beagle’ ((S. viminalis ‘L810203’ x viminalis ‘L81102’) x ‘Astrid’ x male parent unknown), ‘Olof’ (S. viminalis ‘Bowles Hybrid’) x ((S. schwerinii ‘L79069’) x ((S. viminalis ‘L78195’ x viminalis ‘L78101’) ‘Orm’) ‘Bjorn’). ‘Ashton Stott’ (S.viminalis ‘Bowles Hybrid’) x S.dasyclados ‘Korso’, ‘Tora’ (S. schwerinii ‘L79069’) x ((S. viminalis ‘L78195’ x viminalis ‘L78101’) ‘Orm’), and ‘Torhild’ ((S. schwerinii ‘79,069’) x ((S. viminalis) x S. viminalis ‘L78195’ x viminalis ‘L78101’)) ‘Orm’) ‘Tora’) x ((S.viminalis ‘L78195’ x viminalis ‘L78101’) ‘Orm’) were grown in large mono-plots or within plots of intimate mixtures. Over a seven year period half of the plots were harvested on a two-year harvest cycle (three harvests) and the rest on a three-year harvest cycle (two harvests). At the end of this 7 year trial period there were no significant differences between total dry weights or stool survival, irrespective of harvest interval. With the realisation of the importance of this finding for more regular crop management practices, the experiment was continued for a further six years allowing for a further round of two and three year harvests. Results suggest that there ultimately are yield penalties, although these may be minimised by careful and appropriate clonal selection.en© 2021 Elsevier Ltd This manuscript is distributed under a Creative Commons Attribution-NonCommercial-NoDerivs License (https://creativecommons purposes, provided the author and source are cited.SRC WillowSalixGenotypeHarvest intervalBiomassYieldArticle