Modelling deep drainage rates of irrigation strategies under cropping sequence in subhumid, subtropical Australia

Article

Kodur, S. and Robinson, J. B.. 2014. "Modelling deep drainage rates of irrigation strategies under cropping sequence in subhumid, subtropical Australia ." Irrigation and Drainage. 63 (3), pp. 365-372. https://doi.org/10.1002/ird.1813

Article Title	Modelling deep drainage rates of irrigation strategies under cropping sequence in subhumid, subtropical Australia
ERA Journal ID	4213
Article Category	Article
Authors	Kodur, S. (Author) and Robinson, J. B. (Author)
Journal Title	Irrigation and Drainage
Journal Citation	63 (3), pp. 365-372
Number of Pages	8
Year	2014
Place of Publication	United Kingdom
ISSN	0971-7412
	1531-0353
	1531-0361
Digital Object Identifier (DOI)	https://doi.org/10.1002/ird.1813
Web Address (URL)	http://onlinelibrary.wiley.com/doi/10.1002/ird.1813/abstract
Abstract	Water availability is a major concern for irrigated vegetable cropping in the Lockyer Valley area of Australia. Soil water balance and in particular deep drainage were modelled for a representative site of this area for a range of irrigation scenarios over 12 years of cropping sequence. A scenario that refilled the soil to the drained upper limit (DUL) resulted in 530 mm yr-1 of irrigation, 673 mm yr-1 of transpiration and 84 mm yr-1 of deep drainage, whereas maintaining the soil to DUL+25% and DUL+50%, with soil moisture between DUL and saturation (75 and 50% free water respectively), resulted in similar transpiration but with increased irrigation (up to 717 mm yr-1) and deep drainage (up to 262 mm yr-1). For a given amount of available water, irrigations at fixed intervals were found to be less efficient (reduced crop transpiration) than irrigation scheduled according to a soil water deficit. This highlights the importance of moisture monitoring to optimize irrigation use efficiency. The study suggests solutions to improve irrigation efficiency by minimizing deep drainage under cropping sequences.
Keywords	deep drainage; HowLeaky modelling; moisture regime; transpiration
ANZSRC Field of Research 2020	400513. Water resources engineering
Public Notes	Files associated with this item cannot be displayed due to copyright restrictions.
Byline Affiliations	Department of Natural Resources and Mines, Queensland
	Department of Environment and Resource Management, Queensland
Institution of Origin	University of Southern Queensland

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