Preliminary Study on Determining Stem Diameter Variations of Sympodial Orchid

Changes in stem diameter of orchid plants were investigated in a control growing climate. Previous studies have focused on stem diameter in relation to plant water on terrestrial plants in order to schedule the irrigation. The objective of this work was to evaluate the ability of the strain gauges to capture changes in the epiphytes plant stem. Experiments were carried out by using the sympodial orchid, Dendrobium Sonia in a stressed condition. From the findings, the sensor can detect changes in the plant stem and the result can easily be used as a reference for further studies for the development of a proper watering system.

Authors:

• N.M Khairi
• M.I. Naimah
• M.S.B. Shah Rizam
• M.T. Nooritawati
• Z.A. Husna

Keywords:

• Strain gauge
• stem diameter
• Dendrobium Sonia
• epiphyte
• terrestrial

References:

[1] Jordi Doltra, José Antonio Oncins, Joan Bonany and Moshe Cohen,
"Evaluation of plant-based water status indicators in mature apple trees
under field conditions," Irrigation Science, vol.5, no.4, pp.351-359,
2006.
[2] F. Moreno, W. Conejero, M.J. Martin-Palomo, I.F. Giron, A.Torrecillas,
" Maximum daily trunk shrinkage refernces values for irrigation
scheduling in olive trees", Agricultural Water Management 84, pp. 290-
294, 2006.
[3] D.S. Intrigliolo, J.R. Castel, " Crop load effects maximum daily trunk
shrinkage of plum trees", Tree Physiology 27, pp. 89-96, 2007.
[4] W. Conejero, J.J. Alarcon, Y. Garcia-Orellana, J.M. Abrisqueta,
A.Torrecillas, " Evaluation sap flow and trunk diameter sensors for
irrigation scheduling in early maturing peach trees", Tree Physiology
27, pp. 1753-1759, 2007.
[5] J.E. Fernandez, M.V. Cuevas, "Irrigation scheduling from stem
diameters variations : A review", Agricultural and Forest Meteorology
150, pp. 135-151, 2010.
[6] R.B. Thompson, M. Gallardo, L.C. Valdez, M.D. Fernandez, " Using
plant water status to define threshold values for iriigation management of
vegetable crops using soil moisture sensors-, Agriculturel Water
Management 88, pp. 147-158, 2007.
[7] Tom De Swaef, Kathy Steppe, Raoul Lemeur, " Determining reference
value for stem water potential and maximum daily trunk shrinkage in
young apple tree based on plant response to water deficit", Agricultural
Water Management 96, pp. 541-550, 2009.
[8] Klepper B, Browning VD, Taylor HM, "Stem diameter in relation to
plant water status," Plant Physiol vol.48, pp. 683-685, 1999.
[9] S.O. Link, M.E. Thiede and M.G. van Bavel, "An improved strain-gauge
device for continuous field measurement of stem and fruit diameter"
Journal of Experimental Botany, vol. 49, no. 326, pp. 1583-1587,
September 1998.
[10] E. Fereres, D.A. Goldhamer, "Suitability of stem diameter variationsand
water potential as indicators for iirigation scheduling of almond trees",
Journal of Horticultural and Biotechnology78 (2), pp. 139-144, 2003.