Fertilizer if stored properly (dry, cool) has a very long self life, 30 or 40 years at least.
The fertilizer in Beirut was stored in a warehouse lose which allow it to absord moisture over six years, and next to explosives and a large store of fireworks. Workers using welding tools started a fire which ignited the fireworks which in turn spread to the fertilizer setting it off.
The beirut example is a good example of how not to store fertilzer.
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