Which of the following is not a major fertilizer that has been obtained primarily from native sources (i.e., not synthesized by humans)?
A)ammonia gas
B)saltpeter
C)compost
D)All of the above are from natural sources (some more natural than others).
E)none of the above

Question

Quizplus · Accepted Answer

Ammonia gas is typically synthesized by humans through the Haber-Bosch process, whereas saltpeter and compost are obtained from natural sources.

Which of the Following Is Not a Major Fertilizer That