<Table> <Tr> <Th> Common name </Th> <Th> Chemical name </Th> <Th> Formula </Th> </Tr> <Tr> <Td> Potash fertilizer </Td> <Td_colspan="2"> c. 1942 potassium carbonate (K CO); c. 1950 any one or more of potassium chloride (KCl), potassium sulfate (K SO) or potassium nitrate (KNO). Does not contain potassium oxide (K O), which plants do not take up . However, the amount of potassium is often reported as K O equivalent (that is, how much it would be if in K O form), to allow apples - to - apples comparison between different fertilizers using different types of potash . </Td> </Tr> <Tr> <Td> Caustic potash or potash lye </Td> <Td> potassium hydroxide </Td> <Td> KOH </Td> </Tr> <Tr> <Td> Carbonate of potash, salts of tartar, or pearl ash </Td> <Td> potassium carbonate </Td> <Td> K CO </Td> </Tr> <Tr> <Td> Chlorate of potash </Td> <Td> potassium chlorate </Td> <Td> KClO </Td> </Tr> <Tr> <Td> Muriate of potash </Td> <Td> potassium chloride </Td> <Td> KCl: NaCl (95: 5 or higher) </Td> </Tr> <Tr> <Td> Nitrate of potash or saltpeter </Td> <Td> potassium nitrate </Td> <Td> KNO </Td> </Tr> <Tr> <Td> Sulfate of potash </Td> <Td> potassium sulfate </Td> <Td> K SO </Td> </Tr> <Tr> <Td> Permanganate of potash </Td> <Td> potassium permanganate </Td> <Td> KMnO </Td> </Tr> </Table> <Tr> <Th> Common name </Th> <Th> Chemical name </Th> <Th> Formula </Th> </Tr> <Tr> <Td> Potash fertilizer </Td> <Td_colspan="2"> c. 1942 potassium carbonate (K CO); c. 1950 any one or more of potassium chloride (KCl), potassium sulfate (K SO) or potassium nitrate (KNO). Does not contain potassium oxide (K O), which plants do not take up . However, the amount of potassium is often reported as K O equivalent (that is, how much it would be if in K O form), to allow apples - to - apples comparison between different fertilizers using different types of potash . </Td> </Tr> <Tr> <Td> Caustic potash or potash lye </Td> <Td> potassium hydroxide </Td> <Td> KOH </Td> </Tr>

How much of k is in muriate of potash