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[–] Wedhro 0 points 2 points (+2|-0) ago 

Or you could just compost your trash/poop and feed it to worms to get the best slow-release fertilizer ever, almost for free, not to mention the benefits of not needing chemical labs nor polluting the land with said trash/poop. Bonus: multiple beneficial effects on soil structure and microfauna.

Cons: sorry, no patents nor nobel prizes.