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Since the 20th century, the production of nitrogen fertilizer has been playing a pivotal role.

Ammonium nitrogen fertilizers include ammonium bicarbonate (NH4HCO3), ammonium sulfate {(NH4)2SO4}, ammonium chloride (NH4Cl), ammonia water (NH3·H2O), liquid ammonia (NH3), etc.

Nitrogen fertilizer refers to a unit fertilizer that uses nitrogen (N) as the main component and has a marked amount of N, which can provide plant nitrogen nutrition when applie...