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Huge Explosion at Texas Fertilizer Plant
A massive explosion took place around 8:50pm ET at a fertilizer plant in a small town in Texas. The cause of the explosion is not precisely known, but the plant was on fire beforehand. The casualty reports are tentative and expected to rise, but two people are dead and over 150 are injured. Firefighters responding to the initial fire are unaccounted for. Over a thousand residents have been evacuated from their homes. Officials are worried about the volatility of another tank at the plant, but also about the potential damage from exposure to anhydrous ammonia. The blast was heard in Dallas, 75 miles away. "There are lots of houses that are leveled within a two-block radius. A lot of other homes are damaged as well outside that radius." A brief YouTube video shows the explosion of the plant.
Fertilizer itself is inert, but under certain conditions it may explode. In any case after that bombing sale of fertilizer is severly restricded and I suppose non-farmers are not even capable of obtaining big amount of it. So, if somone wants to make a huge explosion by fertilizer the only other option (apart from stealing it) is to set it on fire wherever it may be.
What you are saying only applies to ammonium nitrate fertilizer.
Ammonium phosphate is also commonly used as an ingredient for fertilizers, and not only won't explode--it's actually used in fire extinguishers.