In a 10-6-4 fertilizer, what does the middle number indicate?

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Prepare for the NOCTI 6157 Pennsylvania Applied Horticulture Test. Study with flashcards and multiple choice questions with hints and explanations. Ace your exam!

Multiple Choice

In a 10-6-4 fertilizer, what does the middle number indicate?

Explanation:
The middle number shows how much phosphorus is in the fertilizer, usually listed as phosphorus content as P2O5. So a 10-6-4 fertilizer has 6% phosphorus (as P2O5). The first number is nitrogen for leafy growth, and the last number is potassium for overall vigor and fruiting. Sulfur isn’t part of this three-number N-P-K labeling, though it may appear separately in some formulations.

The middle number shows how much phosphorus is in the fertilizer, usually listed as phosphorus content as P2O5. So a 10-6-4 fertilizer has 6% phosphorus (as P2O5). The first number is nitrogen for leafy growth, and the last number is potassium for overall vigor and fruiting. Sulfur isn’t part of this three-number N-P-K labeling, though it may appear separately in some formulations.

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