Ground Cover Supplement : GC Supplement - Spray application 2016
17 Decision support Ground Spray app A smartphone app that compares nozzles from different manufacturers is being developed by researchers from the University of Queensland (UQ) and the University of Nebraska– Lincoln (UNL) in the US. There are apps available that provide basic information, such as the spray quality produced by a nozzle at a particular pressure; however, comparisons of nozzles are from within a single manufacturer’s range and are generally based on spraying water only. The measurements of droplet size or spray quality for different nozzle brands are not directly comparable because the measurements may have been made in different laboratories around the world, depending on where the manufacturer is located. The Ground Spray app (http://pat.unl.edu/droplet-size-calculator) – which incorporates data from UQ’s droplet size research – will help avoid confusion between multiple sources of data on sprays. The app shows the impact of changes in the tank mix and provides an indication of the amount of small droplets produced. Currently, the app only includes a limited range of tank mixes and adjuvants, using imperial units rather than metric; however, there are plans to extend the app to include metric units. The app is the result of links between the UQ and UNL wind-tunnel facilities, as well as those of the US Department of Agriculture, which has been supported by the GRDC to help extend the number of tools in the operators’ toolbox for essential performance data on sprays. The Ground Spray app can be downloaded for free from the Android and iOS App stores. Ground Spray app opening screen: many apps can provide spray-quality information based on spraying water, the University of Nebraska–Lincoln app provides droplet size data on a limited range of tank mixes. Ground Spray app data input screen: spray operators can use the app to compare the outputs of a range of nozzles. SOURCE: UNL ¢ outputs: once the spray set-up has been fully defined by the nozzle, pressure, angle and tank mix, the relative performance indices are shown on the right of the calculator screen. While the list of products is not exhaustive, the calculator can be updated as new products are tested. The calculator will also be updated to refine spray-coverage assessments for different types of targets. In some situations operators may wish to consider alternative set-ups to improve spray coverage for efficacy reasons. The calculator will allow them to do this and at the same time show changes in the amount of fines (drift-prone droplets) produced and other parameters critical to making an informed decision. The researchers intend to use industry feedback to develop the calculator as an app for smartphones and tablets. □ G RDC Research Code UQ00060 More information: Dr Andrew Hewitt, 07 5460 1307, firstname.lastname@example.org Contact Dr Andrew Hewitt to request a copy of the Australian Spray Performance Calculator.
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