Trials have proven to be successful with higher operational speeds achieved than was first planned, accoridng to Gps-Ag.

Gps-Ag sales manager Adam Hutton said the new WEEDit product was a selective spraying system which helped farmers to significantly lower chemical usage and therefore costs.

WEEDit is now being fitted to a wide variety of boom sprays.

Mr Hutton said some farmers were claiming up to 90 per cent chemical cost reduction.

According to Gps-Ag, the two significant features to the success of the product were fast reaction solenoid valves opening in 1millisecond, and highly responsive sensors taking ground samples at 40,000 times per second.

As the boom travels over a weed it is immediately recognised by the sensor which sets off the solenoid valve and chemical is directed onto the weed.

"The sensors are so fast in detecting live plant matter that the signal command from the sensor to trigger the solenoid in fact needs to be delayed; otherwise the nozzles will fire too early - quite amazing even at 25km/h," Mr Hutton said.

"WEEDit selective spraying has certainly passed my initial expectations.

"Early trials in Australia were good, but this last six months of fine tuning has really presented us with a high performance product."

It uses innovative red light colour technology that is partially shifted to near infrared when passed over live plant chlorophyll.

The system requires no ongoing manual calibration and allows the operator to change the sensitivity of the sensor via one touch button in the cab.

Sensors are spaced at 1m on the boom and operated at a height of 1m off the ground.

One sensor can control five solenoids each at 20cm spacings.