If greenhouse plants are nitrogen deficient, which fertilizer would supply the most nitrogen?

If greenhouse plants are nitrogen deficient, which fertilizer would supply the most nitrogen?

• A. 10-10-10
• B. 5-5-5
• C. 20-5-10
• D. 12-6-6

Answer: (C)

Nitrogen content is read directly from the fertilizer label—the first number in the N-P-K ratio is the percentage of nitrogen. To fix a nitrogen deficiency, you want the product with the highest nitrogen percentage, because it delivers more nitrogen per unit weight of product when you apply the same amount. In these options, the fertilizer with the largest proportion of nitrogen will therefore supply the most nitrogen to your plants. The other options have lower nitrogen percentages, so they would deliver less nitrogen if applied at the same rate. So, choosing the one with the highest nitrogen content best addresses the deficiency.

Nitrogen content is read directly from the fertilizer label—the first number in the N-P-K ratio is the percentage of nitrogen. To fix a nitrogen deficiency, you want the product with the highest nitrogen percentage, because it delivers more nitrogen per unit weight of product when you apply the same amount.

In these options, the fertilizer with the largest proportion of nitrogen will therefore supply the most nitrogen to your plants. The other options have lower nitrogen percentages, so they would deliver less nitrogen if applied at the same rate. So, choosing the one with the highest nitrogen content best addresses the deficiency.