Estimation of canopy interception under sprinkler irrigation: a new approach
Paper
Paper/Presentation Title | Estimation of canopy interception under sprinkler irrigation: a new approach |
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Presentation Type | Paper |
Authors | Uddin, Jasim (Author), Smith, Rod (Author), Hancock, Nigel (Author) and Foley, Joseph (Author) |
Journal or Proceedings Title | Proceedings of the Irrigation Australia Conference 2014 |
Number of Pages | 1 |
Year | 2014 |
Place of Publication | Sydney, Australia |
Web Address (URL) of Paper | http://irrigation.org.au/publications-resources/2014-conference-papers |
Conference/Event | Irrigation Australia Conference 2014: Water for Life, Future for All |
Event Details | Irrigation Australia Conference 2014: Water for Life, Future for All Event Date 02 to end of 06 Jun 2014 Event Location Gold Coast, Australia |
Abstract | Interception of water on plant canopy and the subsequent evaporation into the atmosphere is an important part of the irrigation scheduling and it is also considered as an important part of irrigation water use efficiency analysis in agricultural crops. There are various methods that have been used to estimate the canopy interception during sprinkler irrigation but they all have severe limitations. We introduce a new method to estimate crop canopy interception during sprinkler irrigation using eddy covariance–sap flow measurements. In this method, total ET and sap flow were measured using eddy convince and sap flow system during irrigation and nonirrigation periods. The irrigation trials were conducted in a cotton field using a small movable impact sprinkler irrigation system placing the eddy covariance and sap flow system in the centre of the field. The measurements show that during irrigation the total ET increased significantly and the sap flow decreased remarkably. During the drying (post irrigation) period total ET decreased exponentially and sap flow progressively recovered until completely dries the canopy. Canopy interception was estimated as the summation of additional evaporation of intercepted water and the reduction of sap flow during drying. The mean value of cotton canopy interception was found to be 0.30 mm which was roughly 3% of the applied water. |
Keywords | irrigation; plant canopy; canopy interception; evaporation; water use efficiency |
ANZSRC Field of Research 2020 | 300202. Agricultural land management |
Public Notes | Abstract only, as supplied here, published in the Conference Proceedings. No evidence of copyright restrictions preventing deposit. |
Byline Affiliations | National Centre for Engineering in Agriculture |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q2zqw/estimation-of-canopy-interception-under-sprinkler-irrigation-a-new-approach
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