Which one of the following is not a fertilizer?
A
Ammonium sulphate
B
Calcium sulphate
C
Calcium ammonium nitrate
D
Potassium nitrate
Correct Answer: Calcium sulphate
Calcium sulfate is a common laboratory and industrial chemical. In the form of -anhydrite (the nearly anhydrous form), it is used as a desiccant. It is also used as a coagulant in products like tofu. The main sources of calcium sulfate are naturally occurring gypsum and anhydrite which occur at many locations worldwide as evaporites.