A model of macadamia with application to pruning in orchards

White, N. and Hanan, J. (2016). A model of macadamia with application to pruning in orchards. In: M. Wirthensohn, ISHS Acta Horticulturae 1109: XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014): International Symposium on Nut Crops, Brisbane, Australia, (75-81). 17 August 2014. doi:10.17660/ActaHortic.2016.1109.12


Author White, N.
Hanan, J.
Title of paper A model of macadamia with application to pruning in orchards
Conference name ISHS Acta Horticulturae 1109: XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014): International Symposium on Nut Crops
Conference location Brisbane, Australia
Conference dates 17 August 2014
Journal name Acta Horticulturae   Check publisher's open access policy
Series Acta Horticulturae
Publisher International Society for Horticultural Science
Publication Year 2016
Sub-type Fully published paper
DOI 10.17660/ActaHortic.2016.1109.12
Open Access Status Not yet assessed
ISBN 9789462611030
ISSN 0567-7572
Editor M. Wirthensohn
Volume 1109
Start page 75
End page 81
Total pages 7
Language eng
Abstract/Summary A self-organising model of macadamia, expressed using L-Systems, was used to explore aspects of canopy management. A small set of parameters control the basic architecture of the model, with a high degree of self-organisation occurring to determine the fate and growth of buds. Light was sensed at the leaf level and used to represent vigour and accumulated basipetally. Buds also sensed light so as to provide demand in the subsequent redistribution of the vigour. Empirical relationships were derived from a set of 24 completely digitised trees after conversion to multiscale tree graphs (MTG) and analysis with the OpenAlea software library. The ability to write MTG files was embedded within the model so that various tree statistics could be exported for each run of the model. To explore the parameter space a series of runs was completed using a high-throughput computing platform. When combined with MTG generation and analysis with OpenAlea it provided a convenient way in which thousands of simulations could be explored. We allowed the model trees to develop using self-organisation and simulated cultural practices such as hedging, topping, removal of the leader and limb removal within a small representation of an orchard. The model provides insight into the impact of these practices on potential for growth and the light distribution within the canopy and to the orchard floor by coupling the model with a path-tracing program to simulate the light environment. The lessons learnt from this will be applied to other evergreen, tropical fruit and nut trees.
Formatted Abstract/Summary
A self-organising model of macadamia, expressed using L-Systems, was used to explore aspects of canopy management. A small set of parameters control the basic architecture of the model, with a high degree of self-organisation occurring to determine the fate and growth of buds. Light was sensed at the leaf level and used to represent vigour and accumulated basipetally. Buds also sensed light so as to provide demand in the subsequent redistribution of the vigour. Empirical relationships were derived from a set of 24 completely digitised trees after conversion to multiscale tree graphs (MTG) and analysis with the OpenAlea software library. The ability to write MTG files was embedded within the model so that various tree statistics could be exported for each run of the model. To explore the parameter space a series of runs was completed using a high-throughput computing platform. When combined with MTG generation and analysis with OpenAlea it provided a convenient way in which thousands of simulations could be explored. We allowed the model trees to develop using self-organisation and simulated cultural practices such as hedging, topping, removal of the leader and limb removal within a small representation of an orchard. The model provides insight into the impact of these practices on potential for growth and the light distribution within the canopy and to the orchard floor by coupling the model with a path-tracing program to simulate the light environment. The lessons learnt from this will be applied to other evergreen, tropical fruit and nut trees.
Subjects 1108 Horticulture
Keyword Canopy management
FSPM
Light interception
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Sub-type: Fully published paper
Collection: School of Agriculture and Food Sciences
 
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Created: Tue, 31 May 2016, 20:15:28 EST by Jim Hanan on behalf of Learning and Research Services (UQ Library)