Real-time irrigation decision-making and control for site-specific irrigation of cotton using a centre pivot, 2012/13

McCarthy, Alison and Smith, Rod and Hancock, Nigel (2014) Real-time irrigation decision-making and control for site-specific irrigation of cotton using a centre pivot, 2012/13. In: Irrigation Australia Conference 2014: Water for Life, Future for All, 2-6 June 2014, Gold Coast, Australia.

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Automated, site-specific irrigation control systems provide opportunities to deliver irrigation requirements when and where they are needed in spatially variable fields. Site-specific irrigation hardware developed for centre pivots and lateral moves currently involves loading the site-specific irrigation volumes before the irrigation event. However, the required irrigation application often changes during the irrigation event depending on the time taken for the machine to pass over the field. The irrigation volume may be further refined and updated in real-time during the irrigation event using infield measurements (e.g. weather, soil-water) or measurements of the crop from sensors mounted on the irrigation machine (e.g. cameras).
The real-time irrigation control framework 'VARIwise' automatically determines site-specific irrigation requirements using weather, soil-water and plant growth measurements. These use control strategies and crop production models to predict irrigation application that achieve the desired performance objective (e.g. maximise crop yield, water productivity).
An adaptive control strategy trial was conducted on a span of a centre pivot on a cotton crop at Jondaryan, QLD in 2012/13 to demonstrate the integration of infield sensors with a real-time irrigation control system. This utilised real-time, Internet-enabled irrigation control hardware, weather data, soil-water sensors, irrigation machine mounted plant sensing systems and a processor running VARIwise. The plant sensing systems estimated plant density, flower count and boll count from images, and plant height from a distance sensor. The adaptive control trials produced an average yield improvement of 7%, and water use reductions of 4% compared with industry-standard irrigation treatment using FAO-56.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Speech)
Refereed: No
Item Status: Live Archive
Additional Information: Abstract only, as supplied here, published in the Conference Proceedings. No evidence of copyright restrictions preventing deposit.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 23 Apr 2015 05:49
Last Modified: 17 Jul 2017 04:12
Uncontrolled Keywords: variable-rate irrigation; centre pivot; lateral moves; scheduling; irrigation automation
Fields of Research : 09 Engineering > 0906 Electrical and Electronic Engineering > 090602 Control Systems, Robotics and Automation
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.)
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970107 Expanding Knowledge in the Agricultural and Veterinary Sciences

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