Does anyone know the process for creating organic fertilizer.?

Image by Boby Dimitrov
The deeper green line in the grass is where the worm castings were introduced. The grass grows faster and stronger there. This result is visible in just 2 weeks.

Question by Anthony G: Does anyone know the process for creating organic fertilizer.?
I would like to know of different processes for creating Bio(organic) fertilizer, and what are the best ways to develop these fertilizers.

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