The three-year project, involving field trials with growers in the Mid North, looked at pre-emergent herbicide applications in a range of stubble heights and loads, manipulating spray set up (e.g. application volume, droplet size and position of the nozzle above the stubble row) and on-farm case studies.


Stubble loads have increased in recent years with increases in stubble retention and crop yields. This can have an effect on the efficacy of certain pre-emergent herbicides.


July 2014


June 2017

Project participants

Hart Field Site: Sarah Noack.
Bill Gordon Consulting: Bill Gordon.

The problem

Stubble retention can reduce the efficacy of certain pre-emergent herbicides.

The research

Trials studied different herbicides and rates with varied spray application strategies.

More information

Sarah Noack
Hart Field Site
0420 218 420
[email protected]

Research aims

This project aims to improve pre-emergent herbicide efficacy depending on the height and volume of stubble.

In the field

Trials will cover efficacy of pre-emergent herbicides (chemistry and rate), manipulating spray application (water rate, droplet size, time of application, adjuvants and travel speed), and spray nozzles (angle, position, orientation and spray patterns).

Read the research article from October 2017: Simple guide to achieve better spray coverage