Potassium is the name of the chemical element K. K in nature occurs only as ionic salt. As such, it is found dissolved in seawater, and as part of many minerals. Potassium ion is necessary for the function of all living cells, and is thus present in all plant and animal tissues. Together with phosphorus (P) and nitrogen (N) it is soften found in fertilising product as one of the three primary macronutrients for plants: NPK.
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