Final answer:
The control in this experiment is the corn without fertilizer.
Step-by-step explanation:
In the given experiment, the control is the corn without fertilizer. A control group is a group that does not receive the experimental treatment, and in this case, it is the row of corn without fertilizer. By comparing the growth of the corn with fertilizer to the growth of the corn without fertilizer, the scientist can determine the effect of the fertilizer on plant growth.