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Princeton, Indiana | Potassium, calcium, magnesium, and iron are positively charged ions in spray water that cause hardness. The more of these ions present, the harder the water.
Weak acid herbicides exist as negatively charged ions when added to the spray water and they readily attach to positively charge Calcium which is a bad thing. In the case of glyphosate, it forms calcium glyphosate and activity is reduced.
When ammonium sulfate is added to the spray tank FIRST the sulfate attaches to the calcium forming calcium sulfate which takes the calcium out of the game. When glyphosate is added to the tank SECOND it is able to attach to the positively charged ammonium ion forming ammonium glyphosate which has much better herbicidal activity.
Take a look at section 3 in this link from North Dakota State. These guys do a much better job of explaining it than I can.
https://www.ag.ndsu.edu/weeds/weed-control-guides/nd-weed-control-gu...
http://weeds.nmsu.edu/pdfs/AMS_use.pdf
http://www.monsantoito.com/docs/PROMAX_Amonium_Sulfate_use_Hard_Wat... | |
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Dumb AMS? Why Does it work?
