Selection of flow rate and irrigation duration for high performance bay irrigation

Smith, R.J. and Uddin, M.J. (2020) Selection of flow rate and irrigation duration for high performance bay irrigation. Agricultural Water Management, 228:105850. ISSN 0378-3774


Abstract

The maximum efficiency attainable by surface irrigation in any particular situation is determined largely by the soil infiltration characteristic and the flow rate onto the field. Performance evaluations have suggested that higher flow rates than those traditionally recommended can lead to increases of about 20% in the application efficiency of bay irrigation across the dairy regions of southern Australia. However, substantially reduced irri-gation durations are required to realise these efficiency gains and greater precision is required in the selection and management of these shorter durations. In this paper, infiltration characteristic curves representative of the predominant (cracking and non-cracking)soils of the region are used in the surface irrigation simulation model SISCO, for a range of bay lengths and soil moisture deficits, to determine: (i) the flow rates required to achieve the maximum efficiency on the bay irrigated soils of southern Australia; and (ii) the means for real-time estimation of optimum irrigation durations. The aim is provision of guidance to irrigators seeking higher efficiency through the use of higher flow rates.Real-time estimation of optimum time to cut-off must recognise the substantial variations in infiltration within a soil type and with time due to changes in antecedent moisture content, and hence must be adaptive to the conditions prevailing at the time of any irrigation. A method for estimating time to cut-off(previously developed for furrow irrigation), is extended to the hydraulically more complex case of bay irrigation. The method is based on simple linear relationships between the advance time to a nominated point part way down the field and the time to cut-off. Its application to the management of irrigations is demonstrated using data from multiple irrigations of a single bay under varying soil moisture conditions.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Agricultural Engineering (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Agricultural Engineering (1 Aug 2018 -)
Date Deposited: 02 Sep 2020 00:28
Last Modified: 14 Sep 2020 01:09
Uncontrolled Keywords: surface irrigation, border check irrigation, infiltration, simulation, application efficiency, optimization, time to cut-off
Fields of Research (2008): 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070101 Agricultural Land Management
Fields of Research (2020): 30 AGRICULTURAL, VETERINARY AND FOOD SCIENCES > 3002 Agriculture, land and farm management > 300202 Agricultural land management
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9609 Land and Water Management > 960913 Water Allocation and Quantification
D Environment > 96 Environment > 9609 Land and Water Management > 960905 Farmland, Arable Cropland and Permanent Cropland Water Management
Identification Number or DOI: https://doi.org/10.1016/j.agwat.2019.105850
URI: http://eprints.usq.edu.au/id/eprint/39127

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