Dave Mace

  • United States, KS, Wichita

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Dave Mace Wichita, KS
3 years, 7 months ago
from Ag Talk With The Ag Doc
So the putting Mn in the tank with glyphosate helps neutralize the nutrient-inhibiting effect of the herbicide? How much does it typically add to the cost of that application, and when is it more cost-effective to do a separate foliar application of Mn?
Curt Livesay West Branch, IA
2 years, 6 months ago from Ag Talk With The Ag Doc

Hi Dave! I'm so sorry for the delay in getting a response to you. I've attached an article that shows how glyphos ties up micros. The manganese that I work with will run you $3.00 - $3.50 a pint, and you'd use 1 pint per acre co-applied with glyphosate. I'm sure you can find cheaper Mn sources. The problem is that what the government regulates is the percentage of nutrients in a fertilizer (e.g., 6% Mn); however, they do NOT regulate the amount of chelating agent. Some companies use a cheap, weak chelation technique with like citric acid or with lignosulfonic acid and they might throw in a bit of EDTA to claim that they are using an EDTA chelate. If you use a weak chelation agent it can actually fail to protect the Mn from tying up with the glyphos and consequently render your glyphos less effective. That's why I have my growers use Conklin's chelated Mn. If you have any more questions please feel free to give me a call: 641-919-5574.

Foliar-Applied Glyphosate Substantially Reduced Uptake and Transport of Iron and Manganese in Sunflower


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