$13.$ Which fertilizer is known for its high sulfur content?

$-$ A$)$ CAN

$-$ B$)$ Urea

$-$ C$)$ Ammonium Nitrate

$-$ D$)$ Ammonium Sulfate

$14.$ The environmental concern associated with synthetic ammonia production is primarily:

$-$ A$)$ Ozone depletion

$-$ B$)$ Acid rain

$-$ C$)$ Global warming

$-$ D$)$ Eutrophication

$15.$ Potassium Sulfate is preferred over Potassium Chloride for crops that are:

$-$ A$)$ Light feeders

$-$ B$)$ Heavy feeders

$-$ C$)$ Chloride$-$sensitive

$-$ D$)$ Nitrogen$-$sensitive

$16.$ Ammonium Nitrate is often mixed with Calcium Carbonate to produce:

$-$ A$)$ Ammonium Sulfate

$-$ B$)$ Calcium Ammonium Nitrate

$-$ C$)$ Super Phosphate

$-$ D$)$ Triple Super Phosphate