Fixing nute levels in the soil.

I was just wondering if anyone knew any natural ways to boost the levels of nitrogen in my soil besides usiing ferts. Call me crazy or tell me its gonna make my yield lower but i really wanna try and stay away from chemical ferts and grow naturally. I've read that grass clippings could boost N levels and ive heard of making a banana peel "tea" could boost potasium levels and so on. Just wondering what you guys thinkk. Ant info is appreciated. -Chris
 
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