Fertilizers are made from both chemical and organic compounds.
Most chemical fertilizers are synthetically created with a salt base; they provide a high nutrient value, consisting of macro- and micronutrients. Macronutrients are those nutrients needed in large amounts and the presence or absence of any one macronutrient can have a detrimental effect on plant growth.
Micronutrients are trace elements that are needed, in minute quantities, to act as growth regulators in building chemical compounds in plant cells.
Organic plant foods are naturally derived compounds. They usually come in liquid form and are highly concentrated. They contain both macro- and micronutrients, as well as one or more growth stimulants.