High Rainfall Zone (HRZ) Portal

HRZ ryegrass management in southern Australia.

Development and demonstration of local strategies to enable integrated and profitable management of annual ryegrass seed banks in HRZ farming systems of Australia.

southern australian cropping rainfall zones


The Weed Science Research Group leads this project, collaborating with Southern Farming Systems and Mackillop Farm Management Group, funded by the Grains Research and Development Council (GRDC).

Five demonstration sites are established across southern Victoria and the south-east of South Australia.

Demonstration sites

Each site contains four annual ryegrass management strategies of increasing intensity, which were developed with local agronomists. The aim is to demonstrate which strategies provide effective and profitable ryegrass management in the Australian HRZ. Locations, plot layouts, management strategies and data collected for each demonstration site will be shared within the tabs below.

  • Five sites were established in 2018 and sown to break crops, and then cereals in 2019. 
  • Three sites have been continued for 2020: Frances (Faba Beans), Berrybank (Wheat) and Hamilton (Spring-sown Chickpea).


HRZ resources

Title Type Authors

Harvest Weed Seed Control (HWSC) for the southern HRZ

2019 GRDC Booklet James Manson (Southern Farming Systems)

Setting up for chaff lining - tools and tricks

2019 GRDC Booklet Peter Newman
Multiple tactics the best way to control ryegrass in the HRZ 2019 GRDC GroundCoverTM Gurjeet Gill, Alistair Lawson
HWSC – practical implications for growers and advisers 2019 GRDC update paper Craig Davis
HWSC is less effective on annual ryegrass in the southern HRZ 2019 GRDC update paper James Manson (Southern Farming Systems)
Optimising Group A herbicides in canola 2019 GRDC fact sheet Mark Congreve
The role of pre-emergent herbicides in IWM 2019 GRDC update paper Chris Preston, Peter Boutsalis, Sam Kleemann, Gurjeet Gill 
Management of hard to control weeds 2019 GRDC update paper Chris Preston
Take a tactical approach to managing herbicide resistance 2019 GRDC GroundCoverTM Chris Preston
Your guide to agricultural chemical resistance in a nutshell 2019 GRDC GroundCoverTM Paul Umina, Angela Van de Wouw, Ary Hoffmann, Garry McDonald
Managing annual ryegrass in the HRZ 2018 GRDC update paper Gurjeet Gill, Chris Preston, Jon Midwood
Behind every successful HWSC approach is crop competition 2018 AHRI Insight #110 article and video Kirrily Condon
Chaff lining…too good to be true? 2018 AHRI Insight #104 article and video Kirrily Condon
HWSC - beyond windrow burning 2018 GRDC update paper Greg Condon, Kirrily Condon
Weed warriors - latest research on problem weeds and herbicide effectiveness 2018 GRDC update paper Chris Preston, David Brunton, Hue Thi Dang, Peter Boutsalis, Gurjeet Gill
HWSC is now mainstream 2017 AHRI article AHRI
HWSC tools - they all work.
Link to podcast about this work, at the end of article.
2017 AHRI article AHRI
Title Type Authors
Filling the yield gap - Optimising yield and economic potential of high input cropping systems in the HRZ 2018 GRDC update paper Malcolm McCaskill, Kerry Stott, Brendan Christy, Penny Riffkin, Rob Norton, Amanda Pearce, Elly Polonowita, Frank Henry, Debra Partington
Lifting barley productivity in HRZ 2018 GRDC update paper Kenton Porker, Courtney Peirce.
Critical agronomy for optimal canola growth – breaking the top end on yield 2018 GRDC update paper Andrew Ware
Characteristics and habits of Top 20% farm business operators.
Vic HRZ farm business performance
2018 GRDC Update Paper Paul Blackshaw
Economic role of export hay within farming systems 2018 GRDC Update Paper Mike Krause
Title Type Authors
Better pastures, better crops 2018 GRDC update paper Cam Nicholson
Behind every successful HWSC approach is crop competition 2018 AHRI Insight #110 article and video Kirrily Condon
Title Type Authors
Viruses in spring-sown dual-purpose canola in the HRZ of southern Victoria 2018 GRDC update paper Frank Henry, Mohammad Aftab

Fleur Dolman

Key contact

If you wish to contribute to this resource, make a suggestion or request further information, please contact Dr Fleur Dolman.

Contact Fleur Dolman