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IA mixture problem

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In my IA I'd like to alter the amount of bacteria in soil - in which I'll grow plants.

Initially, I was going to vary the amount of sterile soil and compost - which has, for obvious reasons, microbes in it. 

However, compost also has nutrients in it which I can't avoid. How do you think I could change the amount of bacteria without introducing new nutrients/matter. 

I will have a control set-up as well. 

What do you guys think?

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