Help with experimental problem....?

Question

"You have decided to test the effects of 5 garden fertilizers by applying some of each to 5 separate rows of radishes."

1) What is the variable you are testing?

2) What factors should you control?

3) How will you measure the results?

I think the variable is fertilizer, am I correct?

I need help on this, thanks.

Answer 1

Yes, because you are keeping the other factors (type of radish and anything else affecting their growth (light, how much water, etc.)) controlled, or the same.

You would measure the results, I assume, by how averaging the weight of the radishes from each row, as the root of the plant is the only part most folks have any use for.