Page "Fertilizer" Paragraph 15

Likewise, the number for " K " in Europe can refer to the weight of an equivalent quantity of K < sub > 2 </ sub > O, whereas in Australia it refers to elemental potassium.

In order to calculate the weight of K in the formulation, the weight of K < sub > 2 </ sub > O can be multiplied by 0. 83 to compensate for the weight of the oxygen in the molecule.

For example, a bag of 10-10-10 has 10 pounds of K < sub > 2 </ sub > O, but only 8. 3 pounds of K.