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Ammonium sulfate [(NH4)2 SO4] has been a fertilizer of choice for over 150 hundred years. In one configuration or other, it has served world agriculture and its economy very well. It serves needs from the common front lawn to major farm lots. Broadcast or applied as liquid or granule, it meets almost every fertilizer need. But, as agricultural application technology improves, users needs to understand its use in pop-up fertilization. As growers pursue early planting in cool soils that inhibit early root growth, they have to consider their options.