I'm supposed to do a home experiment & i'm doing 'Impacts of Acid rain on crops' any help appreciated?

You imitate the acid rain by adding acid to the water that you use to water the plants. Say so have six of the same seeds. The first one you water with just water and it's your control. The next you use a 1% acid solution (1 ml of acid for every 100ml of water you use), then a 5% acid solution, etc.