For which of the following fertilizers, sulphuric acid is being used in large amounts?

🔑Key Points:
-For Phosphate fertilizers, sulphuric acid is being used in a large amount.
-By far the largest amount of sulfuric acid is used to make phosphoric acid, used, in turn, to make the phosphate fertilizers, calcium dihydrogen phosphate, and ammonium phosphates.
-It is also used to make ammonium sulfate, which is a particularly important fertilizer in sulfur-deficient.

🔴Additional Information:
-Examples of naturally occurring organic fertilizers include manure, slurry, worm castings, peat, seaweed, and guano. 
-Fertilizers that are high in potassium include burned cucumber skins, sulfate of potash magnesia, Illite clay, kelp, wood ash, etc.
-The nitrogenous fertilizer industry includes the production of synthetic ammonia, nitric acid, ammonium nitrate, and urea.