Evaporation and sapflow dynamics during sprinkler irrigation of cotton
Article
Article Title | Evaporation and sapflow dynamics during sprinkler irrigation of cotton |
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ERA Journal ID | 5245 |
Article Category | Article |
Authors | Uddin, J. (Author), Smith, R. J. (Author), Hancock, N. H. (Author) and Foley, J. P. (Author) |
Journal Title | Agricultural Water Management |
Journal Citation | 125, pp. 35-45 |
Number of Pages | 11 |
Year | 2013 |
Publisher | Elsevier |
Place of Publication | Amsterdam, Netherlands |
Netharland | |
ISSN | 0378-3774 |
1873-2283 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.agwat.2013.04.001 |
Abstract | Quantifying the various components of evapotranspiration during sprinkler irrigation is not only challenging but also difficult to measure and validate using traditional methods. In this paper, measurements of the varying rates of ET using precision energy budget/eddy covariance measurements and sapflow in cotton before, during and after sprinkler irrigation are reported. The trials were carried out at a small scale using small impact type sprinkler irrigation system. Nondimensionalisation of the measured ET and sapflow rates with respect to atmospheric evaporative demand permitted superposition and averaging of multiple time series of data for each of the three phases of irrigation. Significantly higher values of evaporation and reduced values of sapflow were measured during sprinkler irrigation of the cotton crop. The reason for the higher rate of evaporation during irrigation was identified as the evaporation of intercepted water on the canopy, which varied with crop canopy development, and possibly some droplet evaporation during flight. A decreasing rate of evaporation following irrigation represented drying of the residual intercepted water remaining on the canopy after irrigation. Sapflow measurements showed a considerable reduction in transpiration during irrigation and indicated that canopy evaporation is the dominant component of total evapotranspiration during sprinkler irrigation. |
Keywords | eddy covariance; Bowen ratio; evapotranspiration; canopy evaporation; interception; non-dimensionalisation |
ANZSRC Field of Research 2020 | 300207. Agricultural systems analysis and modelling |
300201. Agricultural hydrology | |
300202. Agricultural land management | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | National Centre for Engineering in Agriculture |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q1z7y/evaporation-and-sapflow-dynamics-during-sprinkler-irrigation-of-cotton
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