I'd be happy to, Pat. There are two issues here. First of all, the uptake of nutrients slows as the plant develops in and through the reproductive stages. Therefore, the application of Mn at R3 strikes me as WAY too late to reasonably expect a response in the first place. Second, we know that when you should REALLY expect to get a good bang for your buck with Mn on soybeans deals with glyphosate. Glyphosate inhibits the translocation of micronutrients (see the link attached... and yes, I KNOW that that's sunflowers and not soybeans, but the same concept applies. This is just the study I had at my fingertips). Dr. Huber's research has also shown similar conclusions. Finally, the data I have from my own growers demonstrates that co-application of the proper form of Mn along with glyphosate can dramatically reduce yellow flash (which ties back to the study linked here). In short, the timing was wrong, and the soybeans weren't deficient in Mn; however, in the proper conditions foliar Mn will work very well. I'm happy to work with growers individually who would like to know more about that as well: 641-919-5574. Hope that answers your question :)http://research.sabanciuniv.edu/128/1/stvkaf01889.pdf
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?
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.http://research.sabanciuniv.edu/128/1/stvkaf01889.pdf
hahaha, just realized I shared the same article twice. Oh well! It's worth reading twice ;)
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