UAN

How volatile is ammonium sulfate on dry, bare ground? I want to broadcast 200 pounds per acre ahead of planting wheat on dry land. Will it last a couple of weeks without rain?

Ammonium sulfate is virtually non-volatile as long as we are referring to non-calcareous soils. Accordingly, ammonium sulfate is recommended over urea or urea-containing products (such as urea ammonium nitrate solutions) whenever broadcast applications are not followed by

When it comes to fertilizer injury, is there any difference between nitrogen and sulfur sources?

Yes. Urea, urea ammonium nitrate and ammonium thiosulfate can cause more damage from ammonia toxicity than ammonium sulfate or ammonium nitrate. For this reason, the former three sources are not recommended for applications in close proximity to