Plant different crops in a nearby fertilized field. Water the crops in the field before adding fertilizers. Add many different fertilizers to the field at once. Record the appearance of the crops before fertilizing.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A farmer wants to know if adding fertilizer to his field will make his crops healthier. Which activity should the farmer do first?
Possibilities:
- Plant different crops in a nearby fertilized field.
- Water the crops in the field before adding fertilizers.
- Add many different fertilizers to the field at once.
- Record the appearance of the crops before fertilizing.

Record the appearance of the crops before fertilizing.