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

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. ISSN 1531-0353

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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty / Department / School: Current - Institute for Agriculture and the Environment
Date Deposited: 04 Aug 2016 05:41
Last Modified: 08 Dec 2016 04:41
Uncontrolled Keywords: deep drainage; HowLeaky modelling; moisture regime; transpiration
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090509 Water Resources Engineering
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: 10.1002/ird.1813
URI: http://eprints.usq.edu.au/id/eprint/29573

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