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Journey to here

Testing the Mill Testers

27/7/2021

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Keep it unbiased, simple, efficient and repeatable = Increased confidence in testing results with David Brunton from The Adelaide University’s Weed Science Research Group 
  1. Seed Terminator only uses susceptible Ryegrass for mill testing because it germinates with 90-95% establishment in the untreated samples. 
  2. The same process is followed every time using a bench test stand. Weeds present in paddocks are patchy, the flow through a given harvester changes (difficult to standardise settings between machines), which in turn makes kill testing very difficult to evaluate in field with scientific rigour. In field analysis also struggles to differentiate weeds which have not germinated as a result of innate dormancy or seed kill caused by the mill.
  3. Ryegrass samples will have different seed weights (like test weight), different moisture content and therefore require very different energy to kill. It is therefore critical that a reference mill is used in each set of testing to refer back to e.g. the Seed Terminator MY17, MY18 & MY19 mill technology will be tested side by side with the same batch of seed
  4. Kill test only in normal winter growing season, mimicking everything in all of our treatments are what would normally happen in a field environment (if tested in summer, it may influence the results in a negative way) 
  5. Michael Walsh independently evaluated the Seed Terminator and iHSD in 2017 albeit in field and found the Seed Terminator had 5 times less survivors than the iHSD 
  6. South Australian Grains Industry Trust funded research conducted by Trengove Consulting in 2017 using a test stand found ryegrass weed seed kill was 93% at 2250 rpm and increased to 99% or greater at normal operating speeds (2750–3000 rpm). Results also showed more than 99% control of several other species including wild radish, brome grass, wild oat, bifora, bedstraw and tares and increasing chaff flow rate (harvest rate) did not reduce control of these species.
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Get revenge on weeds

27/7/2021

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Weeds? Pain in the proverbial. We all know that herbicides will eventually lose efficacy due to herbicide resistance, and the rate of new modes of action are few and far between, combine that knowledge with Metabolic resistance and we could be stranded relatively quickly, but what is a realistic answer to this problem?
“At the end of the day we have precious resources, water, sunlight, nutrients - they should go into growing food, fibre and energy. Going into weeds that don't need to exist in the first place is a waste, spending resources on getting rid of them is wasteful and spraying anything other than weeds is again, a waste. There is a lot of innovation still to be had in this space but there is so much out there already that can be adopted today” - Dr Nick Berry 

Throw everything at them

Weeds are excellent at surviving, adapting and evolving to whatever we throw at them, which is why we need to mix up our weed control strategies. 
David Brunton from The University of Adelaide's Weed Science Research Group is researching strategies to prolong the effectiveness of these herbicides by incorporating diverse and sustainable crop production practices
“we’ve spent the past 20-30 years using herbicides to control weeds, think of what you will do in 5-10 years if we continue to rely on herbicides and are no longer able to control problematic weeds using herbicides due to resistance?” he says. 
Annual ryegrass is one of these problematic weed species, which has developed resistance to a number of pre and post-emergent herbicides, across multiple herbicide groups (modes of action). The current story of herbicide rotation has clearly been demonstrated as a non-sustainable long-term tactic. Incorporating non-herbicidal methods of weed control in combination with strategic herbicide use is fundamentally the way forward.
So what are some of the options?
  1. Harvest Weed Seed Control (HWSC) – includes chaff carts, narrow windrow burning, chaff tramlining / chaff lining and mill technology e.g. the Seed Terminator. Not all weed seeds are captured at harvest, but why spread next years weeds up and down the paddock?
  2. Crop competition – works well with HWSC and improves herbicide efficacy as well as being stand-alone weed control in its own right
  3. Mouldboard ploughing – 98% suppression of weeds in the seed bank and significant yield response in year 1 with a long term benefit to follow
  4. Strip and Disc farming – this is an in depth topic; in short helping and hindering different weeds but it does change the weed seed bank dynamics
  5. See and Spray technology – still a herbicide but can reduce herbicide use by 95%+ in some situations and can make higher rates or more expensive chemicals more feasible
  6. Healthy soil – if the crop grows better, naturally there is higher suppression of weeds (eg. mouldboard ploughing and lime application)
  7. Double break crops – still talking herbicides here but get the benefit of a disease break eg legume, canola
  8. Companion planting – sowing a range of species then either harvesting them all or terminating some and harvesting the cereal that remains. 
Why Harvest Weed Seed Control?
“It seems crazy that we spend a lot of time and money killing weeds all year only to reward the survivors at harvest and spread them out so we have something to spray next year”
- Peter Newman, Planfarm Extension Agronomist 

The weeds present at harvest are the fittest, they are the ones who have escaped in season control. We know that each surviving weed can produce a huge number of seeds to spread back onto the paddock to be the following years weed problem and worse yet, we wonder why the weeds missed the in-season control, was there a spray issue? Have the weeds evolved dormancy? Or worse, are the surviving weeds herbicide resistant? 
Dr Nick Berry states "you couldn't design a better weed seed spreader than a combine harvester. ​It separates the grain out, then the weeds go round and round the tailings, distributing them nicely across the paddock." There are three aims with HWSC  
1 | Stop the spread of weeds
​2 | Drive the weed population down

3 | Target Herbicide Resistant weeds 

You can see from the graphic below at harvest we have a real opportunity to target the fittest weed seeds with Harvest weed seed control measures. 
Using the Seed Terminator weed and volunteer seeds are captured and pulverised, preventing them from being spread back onto the paddock to grow next year. By adding weed control at harvest farmers are able to specifically target any potential herbicide resistant weeds while reducing the weed seedbank each season without any additional passes and controlling the green bridge. This can result in maintaining the longevity of herbicides in general but also allow farmers to be more selective with choices around herbicides and allowing them to lower production costs. ​
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    Kelly Ingram 

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