A Farmer Is Growing Corn, Which Requires High Levels of Nitrogen.Corn

Multiple Choice

A farmer is growing corn, which requires high levels of nitrogen.Corn does not have root nodules with nitrogen-fixing bacteria and therefore cannot produce its own nitrogen.What will most likely happen to the soil's nitrogen content if corn is grown in the same place year after year?

A) It will increase rapidly, as nitrogen-fixing bacteria immediately move in.
B) It will decrease at first, then increase as nitrogen-fixing bacteria move in.
C) It will decrease continuously until it becomes nitrogen-deficient.
D) It will remain stable, as the corn becomes accustomed to lower nitrogen levels.
E) It will remain stable, as nitrogen will enter the field through runoff.