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<p>The chemical formula K<sub>2</sub>O (or simply 'K') is used in several industrial contexts: the <a href="page.php?w=N-P-K">N-P-K</a> numbers for <a href="page.php?w=fertilizer">fertilizer</a>s, in <a href="page.php?w=cement_chemist_notation">cement formulas</a>, and in <a href="page.php?w=glass_batch_calculation">glassmaking formulas</a>. Potassium oxide is often not used directly in these products, but the amount of potassium is reported in terms of the K<sub>2</sub>O equivalent for whatever type of <a href="page.php?w=potash">potash</a> was</p><p>
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