How to stop NH4NO3 from absorbing moisture?

Question

I need some help in stopping ammonium nitrate from absorbing water, is there something I could mix it with like oil to stop it from taking up moisture? A bit of moisture doesn't matter though thanks people for your help in advance. Best answer is the first one that works the best and NO I am not trying to make ANFO or any other high explosives I am just at an impasse on how to nullify it's hygroscopic properties. (I think thats how you spell it).

Answer 1

O..oo..oo...is it ammonia Nitrate try heating it

Answer 2

Put the ammonia nitrate in plastic bags. Before you seal them put a piece of cloth drenched in glycerol on it. Glycerol is also hydroscopic and will take the humidity already absorbed and the humidity coming in in the future.

Answer 3

Whenever I've needed to keep anything dry, I've stored it in a dessicator with some calcium chloride in the bottom.  

For a full explanation see here: http://en.wikipedia.org/wiki/Dessicator