Potash: Deposits, Processing, Properties and Uses - D.E. Garrett - Google Books

https://books.google.de/books?id=_MIjCQAAQBAJ&pg=PA213#v=onepage&q&f=false

Potash is the term generally given to potassium chloride, but it is also loosely applied to the various potassium compounds used in agriculture: po tassium sulfate, potassium nitrate or double salts of potassium and magne sium sulfate (generally…