Question

When it comes to fertilizing fields, what three nutrients are known as the “secondary nutrients”?

(a) Calcium, nitrogen and water

(b) Calcium, sulfur and magnesium

(c) Nitrogen, phosphorus, potassium

(d) Potassium, phosphorus and zinc

I got this question in unit test.

My question comes from Dairy Facts in section Dairy Laws of Dairy Engineering

Answer 1

Right choice is (b) Calcium, sulfur and magnesium

To elaborate: Nitrogen, phosphorus, and potassium are referred to as primary nutrients and must be supplied periodically to turf through fertilizer applications. Calcium, magnesium, and sulfur, the secondary nutrients, are needed only occasionally in the form of fertilizer or lime.