Graham Betts: We're on the Matrosses' property near Maitland in South Australia, and originally the sprayer was plumbed at 20-inch nozzle spacing and poly plumbing. We've chosen to go stainless steel for two reasons: it's easy to mount and also it doesn't have decontamination issues as much as poly. The other thing we've chosen to do is match the nozzle spacing to the crop row width, and in this case, it's 15 inches. The Matrosses have chosen to go with the Seletron system. What this gives them is the flexibility to have every nozzle body turn on and off, and every nozzle body is virtually a boom section.

Also, to give nozzle choice a bit more flexibility, they put the triples on to give them a three-nozzle option. The other thing we took advantage of is to install boom recirculation. What we do is feed the liquid into one end of the boom section and, obviously, we've got this fitting on the other end of the boom section. This gives us the ability to remove the fitting there and flush the line out, or while they're spraying, they can have boom recirculation happening.

On the end of this line at the top of the tank is a boom valve, and when the master switch is turned off, the liquid goes through there. So we're having no residue issues. Also, the other benefit of this is we can prime the lines with chemical and don't have to flush the whole boom out. There's no need to waste 100-150 litres to flush the lines.