Ammonium sulfate, (4)24, is an inorganic with a number of commercial uses. The most common use is as a soil fertilizer. It contains 21% nitrogen as , and 24% sulfur as . In fertilizer the purpose of the sulfate is to reduce the soil PH .

It is used largely as an artificial for . In the soil the sulfate ion is released and forms bisulfate, lowering the balance of the (as do other sulfate compounds such as ), while contributing essential for plant growth.

It is also used as an agricultural spray for water soluble , , and . There it functions to bind iron and calcium cations that are present in both well water and plant cells. It is particularly effective as an adjuvant for 2,4-D (amine), glyphosate, and glufosinate herbicides.

Ammonium Sulfate