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AdvanSix’s agronomy experts are available to answer your questions about how to get the most out of your ammonium sulfate investment. Mercedes Gearhart has overseen agronomic research at AdvanSix for more than 20 years, and has a wealth of knowledge about fertilizer use efficiency and improving crop yields. Check out the questions asked below or ask your own question.
Is the lower salt index of ammonium sulfate the reason why it is a safer fertilizer than urea?
Not exactly, since you would need to compare salt index per unit of nutrient (3.25 for ammonium sulfate, 3.06 for ammonium nitrate and 1.62 for urea). The reason urea is not recommended for starter fertilization is due to the release of ammonia gas, which is toxic to seedlings.