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Plum trees of 'Elena', designed for mechanical harvesting with a straddle self-propelled harvester, were planted in 2008 in the experimental orchard at Dąbrowice at a distance of 4 × 1.5 and 2.0 m. The trees were trained to a central leader to a height of 2.7 m and 1.5 or 2.0 m spread. Plum trees designed for mechanical harvesting with a small tractor-driven harvester were spaced at 4 × 1.0 or 1.5 m and were trellised horizontally on wires stretched along rows 0.8 m above the ground. Fruitsdoi:10.1515/johr-2016-0018 fatcat:hmi3xh2c5nhyjbcpbgf6hy5xme