Evaporation and sapflow dynamics during sprinkler irrigation of cotton

Uddin, J. and Smith, R. J. and Hancock, N. H. and Foley, J. P. (2013) Evaporation and sapflow dynamics during sprinkler irrigation of cotton. Agricultural Water Management, 125. pp. 35-45. ISSN 0378-3774


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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 08 Jul 2013 01:15
Last Modified: 14 Jul 2014 01:34
Uncontrolled Keywords: eddy covariance; Bowen ratio; evapotranspiration; canopy evaporation; interception; non-dimensionalisation
Fields of Research : 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070105 Agricultural Systems Analysis and Modelling
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070101 Agricultural Land Management
Socio-Economic Objective: D Environment > 96 Environment > 9609 Land and Water Management > 960905 Farmland, Arable Cropland and Permanent Cropland Water Management
Identification Number or DOI: 10.1016/j.agwat.2013.04.001
URI: http://eprints.usq.edu.au/id/eprint/23625

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