Ammonium nitrate has the chemical formula NH₄NO₃. Produced as small porous pellets, or “prills”, it’s one of the world’s most widely used fertilizers.

Lewis said the chemical can be safely stored in its pure form by itself. A Pakistani dealer holds fertilizer containing ammonium nitrate in Multan, Pakistan, on Aug. 25, 2011. Khalid Tanveer / AP file ...

Ezio Nalin de Paulo, Fernando Shintate Galindo, Flávio Henrique Silveira Rabêlo, Joaquim José Frazão, José Lavres, Nitrification inhibitor 3,4-Dimethylpyrazole phosphate improves nitrogen recovery and ...