Categories:Wikipedia articles incorporating text from the 1911 Encyclopædia Britannica,
All Wikipedia articles written in American English,
archived copy as title,
Wikipedia articles incorporating a citation from the 1911 Encyclopaedia Britannica with Wikisource reference
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.