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A novel methodology for irrigation scheduling using plant-based measurements and mathematical modelling

Kathy Steppe (UGent) , Raoul Lemeur (UGent) and Dirk De Pauw (UGent)
(2008) Acta Horticulturae. 792. p.631-638
Author
Organization
Abstract
Because water is a scarce resource with often intense competition between different users, the search for an optimal irrigation strategy remains an important research objective. In the present study, a new methodology for irrigation scheduling is developed. The methodology combines the use of biosensors for monitoring plant responses with a mathematical model. The model incorporates a mechanistic description of the dynamic water transport in plants and it allows distinction between radial stem growth and the water-related shrinkage and swelling of the stem. Continuously measured stem sap flow rates are used as input for the model, while model calibration is performed using stem diameter variation data measured with a linear variable displacement transducer. The calibrated model is also able to simulate the stem water potential which is continuously compared to a critical threshold value for determination of the exact timing of the irrigation. The quantity of water to be supplied is obtained by integrating the measured sap flow pattern over time. For this novel methodology to be useful in practice, software was developed as well. This software not only enables the acquisition of the data and real-time visualisation of the plant health status, but also allows real-time simulation and calibration of the mathematical model and, finally, the irrigation scheduling itself. The new methodology allows true plant-dependent irrigation control by predicting the optimal timing for irrigation and the exact amount of water required by the plant.
Keywords
LVDT, control algorithm, sap flow, sensor, stem diameter variation, water potential, software, TREE, STEM

Citation

Please use this url to cite or link to this publication:

Chicago
Steppe, Kathy, Raoul Lemeur, and Dirk De Pauw. 2008. “A Novel Methodology for Irrigation Scheduling Using Plant-based Measurements and Mathematical Modelling.” In Acta Horticulturae, ed. I Goodwin and MG O’Connell, 792:631–638. Leuven, Belgium: International Society for Horticultural Science (ISHS).
APA
Steppe, Kathy, Lemeur, R., & De Pauw, D. (2008). A novel methodology for irrigation scheduling using plant-based measurements and mathematical modelling. In I. Goodwin & M. O’Connell (Eds.), Acta Horticulturae (Vol. 792, pp. 631–638). Presented at the 5th International symposium on Irrigation of Horticultural Crops, Leuven, Belgium: International Society for Horticultural Science (ISHS).
Vancouver
1.
Steppe K, Lemeur R, De Pauw D. A novel methodology for irrigation scheduling using plant-based measurements and mathematical modelling. In: Goodwin I, O’Connell M, editors. Acta Horticulturae. Leuven, Belgium: International Society for Horticultural Science (ISHS); 2008. p. 631–8.
MLA
Steppe, Kathy, Raoul Lemeur, and Dirk De Pauw. “A Novel Methodology for Irrigation Scheduling Using Plant-based Measurements and Mathematical Modelling.” Acta Horticulturae. Ed. I Goodwin & MG O’Connell. Vol. 792. Leuven, Belgium: International Society for Horticultural Science (ISHS), 2008. 631–638. Print.
@inproceedings{692771,
  abstract     = {Because water is a scarce resource with often intense competition between different users, the search for an optimal irrigation strategy remains an important research objective. In the present study, a new methodology for irrigation scheduling is developed. The methodology combines the use of biosensors for monitoring plant responses with a mathematical model. The model incorporates a mechanistic description of the dynamic water transport in plants and it allows distinction between radial stem growth and the water-related shrinkage and swelling of the stem. Continuously measured stem sap flow rates are used as input for the model, while model calibration is performed using stem diameter variation data measured with a linear variable displacement transducer. The calibrated model is also able to simulate the stem water potential which is continuously compared to a critical threshold value for determination of the exact timing of the irrigation. The quantity of water to be supplied is obtained by integrating the measured sap flow pattern over time. For this novel methodology to be useful in practice, software was developed as well. This software not only enables the acquisition of the data and real-time visualisation of the plant health status, but also allows real-time simulation and calibration of the mathematical model and, finally, the irrigation scheduling itself. The new methodology allows true plant-dependent irrigation control by predicting the optimal timing for irrigation and the exact amount of water required by the plant.},
  author       = {Steppe, Kathy and Lemeur, Raoul and De Pauw, Dirk},
  booktitle    = {Acta Horticulturae},
  editor       = {Goodwin, I and O'Connell, MG},
  isbn         = {9789066054875},
  issn         = {0567-7572},
  keywords     = {LVDT,control algorithm,sap flow,sensor,stem diameter variation,water potential,software,TREE,STEM},
  language     = {eng},
  location     = {Milura, VIC, Australia},
  pages        = {631--638},
  publisher    = {International Society for Horticultural Science (ISHS)},
  title        = {A novel methodology for irrigation scheduling using plant-based measurements and mathematical modelling},
  url          = {http://www.actahort.org/books/792/792_75.htm},
  volume       = {792},
  year         = {2008},
}

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