The discussion we had earlier this week about the identity of muriate of potash seemed to provide a simple solution: that muriate of potash was the same thing as potassium chloride. Now I've read something which makes me wonder. One source (the T H Everett Encyclopedia of Gardening from the 1960s) makes the claim that muriate of potash is 85% potassium chloride and 15% sodium chloride. That was written a half century ago. Can any of our chemists comment on whether that might have been true back then but is/is not true now? It seems to me that if muriate of potash contains 15% sodium chloride, then it's not the same thing as potassium chloride - certainly not the same thing as Jim Shields' $100/oz potassium chloride. Table salt might be good for some plants (I've read that it's good for asparagus), but many plants are sensitive to it - and who wants to pay muriate of potash prices for table salt? Jim McKenney