Palestine Potash Company supplied half of Britain's potash during World War II. After the water evaporated, the potassium salts crystallized into beds of potash ore. Common sources are sulfate of potash, potassium bicarbonate, monoammonium phosphate, etc. In general these soils are deficient in lime, magnesia, phosphates, nitrogen, humus and potash. Potassium chloride is extracted from minerals sylvite, carnallite, and potash. Germany is rich in timber, lignite, potash and salt. Nitrogen has a significant impact in the global mineral use, followed by potash and phosphate. Potassium was first derived in 1807 by electrolysis of caustic potash (potassium hydroxide). It is traditionally fertilised with manure, nitrogen, phosphates, and potash. The main potassium-based straight fertilizer is Muriate of Potash (MOP). Halite (rock salt) is produced as a byproduct of potash mining. This was, in order of volume&colon; iron ore, grain and potash. It is also an excellent source of potassium for manufacture of potash and potassium nitrate. The deposits consist of soda, potash, borax and common salt. Davy discovered potassium in 1807, deriving it from caustic potash (KOH).