Attack the weed seed bank
You have two options: 1. Go it alone 2. Learn from the experts We’d pick the second option. If you did too, we have two webinar recordings for you! We cover the best ways to collect and destroy weed seeds present at harvest, how to make harvest weed seed control work in your system (without pulling your hair out), plus share handy tips you only learn by experience. Part 1: Narrow windrow burn like a pro Weeds don’t play fair. Peter Newman (AHRI) and Rod Messina (Mullewa grain grower) discuss how to level up your narrow windrow burning and attack the weed seed bank. They cover how to get started, the pitfalls to look out for, economics of the system, plus modification design options for your harvester. Resources: 10 Point Plan: Create and burn narrow windrows Windrow chute CAD drawings AccuFire Broadacre Firelighter AHRI insight: Tips AHRI insight: Burning wet windrows GRDC video playlist: IWM – narrow windrow burning Part 2: Chaff carts as part of the arsenal How’d you like to reduce your ryegrass and other weed numbers by up to 95%? You would be crazy to say no! Lance Turner (Corrigin grain grower) knows the chaff cart is not a silver bullet, but reckons it’s a pretty big linchpin for his weed management system. Pete and Lance discuss how low weed numbers give you more options, the logistics and economics of collecting chaff and burning the heaps, plus handy tips you pick up with 10 years of experience (Lance has done the hard work for you!). Resources: 10 Point Plan: Tow a chaff cart AHRI’s Ryegrass Integrated Management (RIM) program AHRI’s financials factsheet including nutrient removal (new chaff cart) (second-hand chaff cart) Grazing chaff dumps webinar with Andrew Boultbee GRDC video playlist: IWM – Chaff carts
It’s a numbers game
As herbicide resistance takes hold the only option to continue cropping is to take a long term view and strive for a very low seed bank using a diverse range of tools. Herbicide resistance is not a problem if you have no weeds. The panel features leading weed researchers, farmers and agronomists from across Australia and discusses the range of options available to help manage the weed seed bank, as well as general strategies to help promote the long term sustainability of herbicides.
Post emergent herbicides
Resources Spray resistant radish early for best efficacy and yield (Grant Thompson, Crop Updates paper 2014) Herbicide resistant wild radish (Peter Newman) Controlling herbicide resistant Wild Radish in wheat in the Northern Agricultural Region of WA with a two spray strategy (Peter Newman) Diverse weed control: Left jab, right hook (AHRI insight) Part 2:When is it worth rotating from clethodim (Select®) to butroxydim (Factor®)? Is there any value in rotating the post-emergent herbicides clethodim (Select®) and butroxydim (Factor®)? The research suggests that Factor® will sometimes kill plants that are moderately-resistant to Select® that could help in driving down the weed seed bank. Dr Peter Boutsalis from the University of Adelaide discusses his latest research and observations using both products with AHRI’s Peter Newman.
Setting crops up for success with Dr Chris Preston
Choosing and applying the right pre-emergent herbicide Choosing and applying the right pre-emergent herbicide can be difficult, particularly if herbicide resistance is becoming a challenge in a no-till system. Dr Chris Preston, University of Adelaide (UA) explains the chemistry of pre-emergent herbicides, how they work and what’s best for your operation. You can watch the webinar below for more information. Given the significant up-front cost of buying good quality seed, it’s tempting to cut back on seeding rates to minimise costs. Lead scientist and director of the Graham Centre for Agricultural Innovation at Charles Sturt University, Professor Deirdre Lemerle takes the opposite view. She’s calling on growers to consider using high seeding rates and competitive cultivars to suppress weeds and achieve savings through reduced herbicide costs, more reliable herbicide performance and resistance management.
Win the war against weeds: grazing chaff dumps
Grazing chaff dumps over burning Andrew Boultbee is a grower from York in Western Australia and presents his thoughts on grazing chaff dumps over burning in this webinar. Andrew explains to host AHRI’s Peter Newman that instead of burning the chaff heaps, he grazes them during summer. The sheep flatten the chaff heaps to a tiny pile and help to redistribute some of the nutrients in these heaps back out to the paddock. Diverting weed seeds onto permanent tramlines Peter Newman and Esperance grower Mark Wandel discuss the latest practice of diverting weed seeds onto permanent tramlines. As an add-on benefit to a controlled traffic system, diverting chaff from the harvester into compacted wheel tracks or tramlines gives harvested weed seeds a tough environment to grow and spread. You can watch the webinar in full below.