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Wikipedia articles incorporating text from the 1911 Encyclopædia Britannica,
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A fertilizer or fertiliser is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply one or more plantnutrients essential to the growth of plants.
Material of natural or synthetic origin applied to soils or to plants to supply essential nutrients
A fertilizer, natural or synthesized, containing nitrogen available for fixation by vegetation, such as potassium nitrate or ammonium nitrate.
Fertilizer manufactured from chemicals; excessive use of them can cause pollution, when all the chemicals are not taken up by the plants and the excess is leached out of the soil into rivers and may cause algal bloom.
Substance added to soil for the purpose of promoting plant life, usually containing nitrogen, potassium and phosphorus, e.g. manure, guano, rock phosphates.
A natural substance that is used to make the ground more suitable for growing plants.