(Table 3). However, ‘Price’ trees on ‘Bright’s Hybrid’ rootstock produced substantially more crop than with the other rootstocks, producing 2.9 t/ha compared with 2.2 t/ha on the next best, which was ‘Garnem’ rootstock. • All trees on ‘Bright’s Hybrid’ rootstock produced numerous short to medium lateral shoots, in addition to the normal component of long shoots that become large scaffold branches in the mature tree (Figure 4). Although no data were collected, this response to ‘Bright’s Hybrid’ rootstock was obvious across all scion cultivars in this trial. It is possible that the increased branching with ‘Price’ when budded on ‘Bright’s Hybrid’ rootstock increased the yield from these trees. •‘Price’, a very upright cultivar with acute branching angles, required minimal pruning to create a narrow canopy; in combination with ‘Bright’s Hybrid’ this scion/rootstock combination could be a very interesting option for high density plantings. As part of this project we are also working with almond breeders in Australia, California and Spain to help them to identify new almond cultivars that naturally form narrow, upright tree canopies suitable for orchard intensification. While shell and kernel quality are important breeding targets for almonds, as are self-fertility and pest and disease tolerance, we believe that new cultivars with improved architecture are required for the almond industry to make a step change in productivity. For more information: email@example.com +61 4 2261 0748 The future
Tree height Trunk cross-sectional area (cm 3 )
Table 1. Tree dimensions of almond varieties on four different rootstocks in summer 2020. Trees were planted in July 2016. Data are combined for ‘Nonpareil’, ‘Monterey’ and ‘Price’ trees. Values in each column followed by the same letter were not significantly different (p<0.05).
Tree canopy diameter (m)
Kernel yield (t/ha)
Central leader-narrow prune
Central leader-narrow prune
Table 2. Yield of almond varieties in summer 2020. Trees were planted in July 2016. Control trees were pruned in the nursery to 90 cm and all side branches cut back to two buds. Central leader trees were not pruned in the nursery but were narrow-pruned in the orchard in 2018. Data are combined for trees on ‘Bright’s Hybrid’, ‘Cornerstone’, ‘Garnem’ and ‘Nemaguard’ rootstocks. Values in each column followed by the same letter were not significantly different (p<0.05).
Table 3. Effect of rootstock on yield of ‘Monterey’ and ‘Price’ almonds in 2020. Trees were planted in July 2016. Values in each column followed by the same lower-case letters were not significantly different (p<0.05).
Acknowledgements Project team: Grant Thorp, Ann Smith, David Traeger, Belinda Jenkins, Andrew Granger, Michael Coates (PFR Australia); Andrew Barnett, Michael Blattmann, Edouard Périé, Vincent Mangin, Patrick Snelgar, Stuart Tustin, Jill Stanley and Duncan Hedderley (PFR New Zealand). Industry support: Ben Brown, John Kennedy, Tony Spiers and Andrew Lacey. Casual seasonal workers were provided by MADEC Australia Renmark.
Read AL14007 Final Report on the Hort Innovation website.