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Northern Idaho | Thanks but do you know of any testing done to back the number they give?
Actually the newer version of that UI fertilizer guide (the ones we have to use to receive CSP payments) call for 25lb S as I said in my original post. This same rate is what the UofI suggests for spring wheat, barley, canola, and winter wheat. I doubt that a 40bu spring wheat crop would use the same amount of sulfur as a 110bu winter wheat crop which is what I was asking in the original post. The university has no yield and variable rate of sulfur data to back up the recommendation like they do for the nitrogen.
You must be mistaken about my neck of the woods, we never applied 16-20-0-14 in the fall because sulfur leaches out over winter. Over in the palouse they probably could with deeper soils and less rainfall. We always put down 11-52-0-0 or it used to be 11-55-0-0 in the fall with the seed. Phosphate wont leach out over winter.
Edited by NIF 4/24/2010 10:58
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Sulfur question
