Potassium in Missouri soils
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"Missouri soils may contain from 10,000 to 50,000 pounds per acre of total potassium in the surface plow layer. While this appears to be a very large amount, only 0.1 to 2 percent of this total potassium is readily available for plant uptake (Table 1). Potassium is taken up by plants as the potassium ion, K + . Potassium is commonly called potash. This term referred to the fertilizer value of wood ashes. The ashes came from the wood fires used to heat hanging pots of liquid; therefore, pot ash. In the fertilizer trade, potash refers to the chemical expression K2O. In the description of a fertilizer grade such as 6-24-12, the 6 = percent nitrogen, 24 = percent available phosphoric acid, P2O5, and 12 represents the percentage of potassium, K2O, on a weight basis. Researchers now know K2O is not the effective potassium compound in chemical fertilizers. However, as a carryover from the way chemists expressed analytical results at the turn of the century, the fertilizer industry still uses the expression to designate the true compound. Always keep in mind, plants use potassium in the ionic form (K +)."--First page.
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Archive version. For the most recent information see extension.missouri.edu.
OpenAccess.
OpenAccess.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License.
Provided for historical documentation only. Check Missouri Extension and Agricultural Experiment Station websites for current information.
Provided for historical documentation only. Check Missouri Extension and Agricultural Experiment Station websites for current information.