Definition - What does Organic Fertilizer mean?
An organic fertilizer is a plant fertilizer that is derived from organic sources. Organic fertilizers can range from organic compost to cow manure, but they must be derived from all-organic sources.
Chicken droppings from an organic farm would be considered an organic fertilizer. Additional examples of organic fertilizer sources include kelp, guano, bone and blood meals, molasses, and fish emulsions.
Cow manure from a conventional farm that uses commercial fertilizers and pesticides would not be considered organic.
MaximumYield explains Organic Fertilizer
Organic fertilizers differ from chemical fertilizers in that they feed your plants while building a healthy soil. They are considered the more environmentally friendly option. Soils with plenty of organic material remain loose and light, retain more moisture and nutrients, and foster growth of soil micro-organisms that promote healthier plants and root development.
If a lot of synthetic chemicals are added to a soil, it eventually loses its organic matter percentage and micro-biotic activity, which leads to an unhealthy soil. As organic material is used up, the soil structure deteriorates; it becomes harder and less able to hold water and nutrients.