Natural organic fertilizer

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1. Fertilizers derived from complex organic compounds not readily soluble in water. See also Organic fertilizer and Synthetic organic fertilizer.
2. A nutrient source of plant or animal origin, typically with low nutrient analysis and requiring soil microbial activity to convert nutrients to plant available forms.

manure.jpg

This image is an example of a kind of natural organic fertilizer originating from something living.
Source: http://www.urbanext.uiuc.edu/firstgarden/basics/dirt_06.html