Best spray adjuvant with glyphosate - The Combine Forum
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post #1 of 30 (permalink) Old 09-19-2019, 07:16 PM Thread Starter
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Best spray adjuvant with glyphosate

I farm in a 12” annual rainfall zone and fallow is a common practice in my area. I no-till chem fallow about 40% of my farm each year and it’s something I put a lot of effort into trying to optimize. An average year of fallow for me will take four herbicide applications. A typical tank mix would be:
4.25 GPA carrier volume
6 quarts liquid AMS per 100 gal
24 oz LI-700 per 100 gal
22 - 32 oz RT3 per acre (depending on weed size)
5.5 - 8 oz LV-6 per acre (depending on weed size)
Every part of that recipe has been carefully chosen and tested to try to get the most bang for the buck. I’m always looking for ways to make it more effective/less expensive though.

I’ve been reading a bunch of comparisons on different surfactants and it has caused me to question if LI-700 is the best choice. A number of different sources has indicated that R-11 may be a better product. I’ve never had any experience with it but I understand it has been around quite a while. Is there anything better about the newer products? Does any one have any experience with R-11 or input they would like to share?

Here are some of the comparisons I’ve seen:
https://www.ag.ndsu.edu/weeds/weed-c...s/a5-adjuvants

https://s3.wp.wsu.edu/uploads/sites/...n-WSU-2018.pdf

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post #2 of 30 (permalink) Old 09-20-2019, 12:26 AM
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I had been using a product called pHix, basically was battery acid, was more pH adjuster than surfactant but it definitely turned up the heat on gly / 24d and gly / dicamba mixes (would not use with any suspensions or granules though adjusted the pH enough that they sometimes did not dissolve!). anyway switched to LI700 last year bc it was easier to track down, but I don't think it did quite as good a job, might go back this year.

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post #3 of 30 (permalink) Old 09-20-2019, 01:33 AM
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1 once per acre of Rainfast by Conklin. Just curious, why do you fallow? Thanks.
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post #4 of 30 (permalink) Old 09-20-2019, 10:33 AM Thread Starter
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1 once per acre of Rainfast by Conklin. Just curious, why do you fallow? Thanks.
Fallow is pretty much a requirement in my area if you want to grow a fall seeded crop. The majority of our precipitation comes between the middle of October and April. Its not uncommon to go from the end of May until the beginning of October and only get .3" total precipitation. If we want to be able to have moisture to seed into in the fall fallow is the only we can do that. We can grow spring seeded crops here and I do on a smaller percentage of my acres every year, they are much more risky though due to the not getting any rain after May thing, fall seeded crops are where the money is for us.
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post #5 of 30 (permalink) Old 09-20-2019, 10:38 AM
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Bradw2 if you are lowering the ph I wonder if acetic acid or vinegar would be a good choice. It is cheap. It seems like the conditions at spraying have a lot to do with how the roundup works. Sometimes it just smokes the weeds and other times it just does not work great.
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post #6 of 30 (permalink) Old 09-20-2019, 11:05 AM
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Add some 28?
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post #7 of 30 (permalink) Old 09-20-2019, 03:38 PM Thread Starter
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Bradw2 if you are lowering the ph I wonder if acetic acid or vinegar would be a good choice. It is cheap. It seems like the conditions at spraying have a lot to do with how the roundup works. Sometimes it just smokes the weeds and other times it just does not work great.
This is why I add the 24 oz. of LI-700 to my mix. That's enough to bring my water down to a pH of 5.
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post #8 of 30 (permalink) Old 09-20-2019, 03:39 PM Thread Starter
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Add some 28?
From what I've heard, UAN reduces the efficacy of glyphosate. I add UAN when I use paraquat, but not gly. Haven't tested it though.
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post #9 of 30 (permalink) Old 09-20-2019, 04:02 PM
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Food grade Citric acid works great for lowering the PH. Cheap.
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post #10 of 30 (permalink) Old 09-20-2019, 11:50 PM
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Food grade Citric acid works great for lowering the PH. Cheap.
Where do you source citric acid.

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