Calcium, Magnesium, and Sulfur

FieldWhile nitrogen (N), phosphorus (P) and potassium (K) are the most important of the essential elements for plant nutrition, they are by no means the only important elements. Farmers, scientists and agricultural professionals generally consider calcium (Ca), magnesium (Mg) and sulfur (S) second in importance only to N, P and K--not because they are less essential, but because most crops typically need smaller amounts of those elements.

For additional information on secondary nutrients, click here.