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

question 148

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.

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