Nitrogen Sources Peanut Notes No. 156 2022

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Question:

I have a grower that called in a question. He is concerned with costs, and he has peanuts that are between 60 and 70 days old. A recommendation has been made to apply ammonium sulfate at a rate of 250 lbs/acre to increase nitrogen. Ammonium sulfate is not a very cheap source and he was interested if there were something he could apply for the same money at a higher rate that may possibly give him more nitrogen. What would his options be, if any?

Jordan:

We have not looked at options other than ammonium sulfate. Urea and UAN are likely cheaper but I have not looked at them in recent years. The higher concentration is a concern because of potential burn, but maybe on a dry day it would not have an impact. Do not use dry ammonium nitrate. There is something about that product that results in it not working as well as AMS. Is the farmer worried that peanuts are yellow because it has been cloudy and wet? In my experience when we begin to get sunny days, and if active nodules are present, the peanuts will recover on their own without added N.

Question:

Would blending AMS and Urea be a possibility for reducing costs and still getting the performance?

Jordan:

I would not do that. Mainly because I have not looked at it. Although expensive, I know what AMS will do.