Evaluation of sap flow sensors to measure the transpiration rate of plants during sprinkler irrigation
Paper
Uddin, J., Smith, R. J., Hancock, N. H. and Foley, J.. 2011. "Evaluation of sap flow sensors to measure the transpiration rate of plants during sprinkler irrigation." Banhazi, T., Saunders, C. and Hegarty, R. (ed.) SEAg 2011: Diverse Challenges, Innovative Solutions. Gold Coast, Australia 29 - 30 Sep 2011 Canberra, Australia.
| Paper/Presentation Title | Evaluation of sap flow sensors to measure the transpiration rate of plants during sprinkler irrigation |
|---|---|
| Presentation Type | Paper |
| Authors | Uddin, J. (Author), Smith, R. J. (Author), Hancock, N. H. (Author) and Foley, J. (Author) |
| Editors | Banhazi, T., Saunders, C. and Hegarty, R. |
| Journal or Proceedings Title | Proceedings of the Biennial Conference of the Australian Society for Engineering in Agriculture (SEAg 2011) |
| Number of Pages | 10 |
| Year | 2011 |
| Place of Publication | Canberra, Australia |
| ISBN | 9780858259829 |
| Web Address (URL) of Paper | http://www.engineersaustralia.org.au/events/conferences/seag2011/seag2011_home.cfm |
| Conference/Event | SEAg 2011: Diverse Challenges, Innovative Solutions |
| Event Details | SEAg 2011: Diverse Challenges, Innovative Solutions Event Date 29 to end of 30 Sep 2011 Event Location Gold Coast, Australia |
| Abstract | Accurate measurement of transpiration is needed to quantify the different components of evaporation losses during sprinkler irrigation. Among the different methods for direct measurement of transpiration rate, measurement of sap flow on the basis of heat flow has been widely used. To evaluate the applicability of this method for use in field experiments involving sprinkler irrigation, stem flow measurements on small pot plants were compared with transpiration values estimated from successive mass measurements using pre-calibrated mini-lysimeters. Experiments were conducted in the glass house at USQ during the period August to October 2010. From this study it was found that during steady conditions, the sap flow sensors were able to measure the transpiration rate of plants in reasonable agreement (11% overestimation) with the lysimeter measurements. During canopy wetting (sprinkler irrigation) the decline in sap flow rate was less than and lagged the decline in transpiration rate due to the storage and buffering capacity of the stem. Sap flow sensors at different heights on the plant responded at different rates for the same reason. The study showed that the sap flow sensors do not give an accurate measurement of transpiration during canopy wetting and drying but will still aid interpretation of measurements of total evaporation during sprinkler irrigation. |
| Keywords | sap flow; transpiration; eddy covariance; time lag; mini lysimeter |
| ANZSRC Field of Research 2020 | 300299. Agriculture, land and farm management not elsewhere classified |
| 400999. Electronics, sensors and digital hardware not elsewhere classified | |
| 300201. Agricultural hydrology | |
| Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
| Byline Affiliations | National Centre for Engineering in Agriculture |
| Institution of Origin | University of Southern Queensland |
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