If you take up organic farming, be sure to use organic fertilizer, not some artificial chemical. Organic describes things that are natural or related to nature.
In common usage, organic is used to mean “healthful” or “close to nature.” It can also describe foods grown without artificial pesticides or fertilizers. In other uses, organic refers to living things or material that comes from living things. In a more medical sense, organic means “relating to the organs of the body,” and in a legal sense, organic describes something that is central to an organization or a government.