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

the variable is the fertilizer

you must control the humidity, light, and amount of water each one gets- if it is not equal than the test is flawed

you will measure the results by seeing which plant is bigger and greener

Answer 2

you are right the variable is the fertiliser as its the only thing you are changing

the factors you should control are the seed is perfect & from same batch, soil is consistant & water. make sure area is contained

size, taste & speed of growth as well as how many seeds per area germinate or grow per area should determine the latter