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Although organic fertilizers are costlier than chemical fertilizers, the growth of the plants with organic fertilizers is more harmonious.
humus
The better type of pesticide is organic because it is natural and generally will harm plants less than chemical pesticides.
soil - is a combination of mineral and organic matter, water, and air-- that portion of the regolith that supports the growth of plants. (right from my text book)
By adding fertilizing substances such as plant organic matter to the all-important growth medium. Such organic materials [matter] add Humus to Soil and - 'the more the blacker'.
Vitamins would better be categorized as catalysts (to help chemical reactions in plants and animals). "Organic" has to do with whether it is carbon-based (at least in chemistry it does). Not sure what you mean by "Growth Factors"...
Good organic soil is best for most plants. But some plants prefer sand or rocky soil. Do some research to see what your plants prefer.
Phosphorus is a naturally occurring element, it's used by plants to speed up growth
organic
Both plants and human store energy in the form of organic compounds. The storage in plants generally differs in the nature of organic compounds. It is released through cellular respiration in both cases..
Volatile oils are organic compounds extracted from plants, having generally an intense aroma.
Volcanic ash is devoid of organic matter hence plant growth is not promoted in it. When plant debries get mixed with it and micro-organisms in the presence of moisture breakdown the organic matter into minerals, plant growth may be promoted in that case.