Here is some information. You will have to check with your local fertilizer people to see what is available in your area. But yeah, when you state how many pounds per acre of K is needed we would assume that is actual pounds. Since any form of potash is not pure the analysis is stated in pounds actual per 100 pounds of product. The rest of the bag is "dirt"
Potash fertilizer is the commonly used term for the soil fertilizer forms of potassium (element K). The name comes from collection of wood ash in metal pots when the fertilizer benefits of this material were first recognized many centuries ago.
Muriate of Potash: It's odd how this old-fashioned name remains in use! Muriate comes from Muria, the Latin for brine. Muriate of potash is potassium chloride containing between 50 and 60 per cent potash. It was deposited eons ago by ancient seas and should be considered a natural product, blessed by organocultists, but it is not. Its chlorine content passes off rapidly when applied to soil. As explained under soil organisms, however, muriate of potash is harmful to certain beneficial bacteria. Some authorities think sulfate of potash makes a better potash fertilizer.
Sulfate of Potash: This contains 48 per cent potash. It is more expensive than muriate of potash but is considered less harmful to bacteria and plant roots.
Wood Ashes: About the only generally-available organic source for potash fertilizer, this material is treasured by organic gardeners. Wood ashes contain about 6 per cent potash, plus considerable lime. Before corn cobs were used industrially, the cobs were burned in huge piles. The resultant ashes were peculiarly rich in potash - up to 35 per cent. Almost any ash resulting from burning organic materials that contain some fiber should be a fair source of potash fertilizer. Wood ashes are particularly good to use for adding potash to a compost heap.
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