On a fertilizer labeled 12-4-8, what does the middle number represent?

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Study for the World of Turf Exam 2. Enhance your understanding with a mix of flashcards and multiple-choice questions complete with hints and explanations. Equip yourself for success today!

Multiple Choice

On a fertilizer labeled 12-4-8, what does the middle number represent?

Explanation:
Fertilizer labels use N-P-K to show nutrient percentages by weight. The first number is nitrogen, the middle number is phosphate expressed as P2O5, and the last number is potassium as K2O. So the middle number represents how much phosphate is present, shown in the P2O5 form. In a 12-4-8 blend, that means 4% P2O5. If you ever needed the elemental phosphorus content, you’d convert from P2O5, but the standard labeling uses P2O5.

Fertilizer labels use N-P-K to show nutrient percentages by weight. The first number is nitrogen, the middle number is phosphate expressed as P2O5, and the last number is potassium as K2O. So the middle number represents how much phosphate is present, shown in the P2O5 form. In a 12-4-8 blend, that means 4% P2O5. If you ever needed the elemental phosphorus content, you’d convert from P2O5, but the standard labeling uses P2O5.

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