If a fertilizer analysis is 13-13-13 on an oxide basis, what is the analysis on an elemental basis?

If a fertilizer analysis is 13-13-13 on an oxide basis, what is the analysis on an elemental basis?

• A. 13-6-12
• B. 13-5.7-10.8
• C. 13-8-7
• D. 13-10-10

Answer: (B)

To convert the fertilizer analysis from an oxide basis to an elemental basis, it’s important to understand how the nutrients are represented. In the 13-13-13 analysis, the numbers correspond to the percentages of nitrogen (N), phosphorus (P₂O₅), and potassium (K₂O) respectively, expressed as oxides. When converting phosphorus and potassium from oxide forms to their elemental forms, you need to apply specific conversion factors: 1. For phosphorus pentoxide (P₂O₅), the conversion to elemental phosphorus (P) typically uses a multiplier of 0.44. This means that for every unit of P₂O₅, there are approximately 0.44 units of P. 2. For potassium oxide (K₂O), the conversion to elemental potassium (K) uses a multiplier of 0.83. Thus, for every unit of K₂O, there are about 0.83 units of K. Applying these conversions to the 13-13-13 analysis: - The nitrogen content remains the same at 13% because it is already expressed in elemental form. - For phosphorus, the conversion from 13% P₂O₅ would be 13% (P₂O

To convert the fertilizer analysis from an oxide basis to an elemental basis, it’s important to understand how the nutrients are represented. In the 13-13-13 analysis, the numbers correspond to the percentages of nitrogen (N), phosphorus (P₂O₅), and potassium (K₂O) respectively, expressed as oxides.

When converting phosphorus and potassium from oxide forms to their elemental forms, you need to apply specific conversion factors:

1. For phosphorus pentoxide (P₂O₅), the conversion to elemental phosphorus (P) typically uses a multiplier of 0.44. This means that for every unit of P₂O₅, there are approximately 0.44 units of P.

2. For potassium oxide (K₂O), the conversion to elemental potassium (K) uses a multiplier of 0.83. Thus, for every unit of K₂O, there are about 0.83 units of K.

Applying these conversions to the 13-13-13 analysis:

• The nitrogen content remains the same at 13% because it is already expressed in elemental form.

• For phosphorus, the conversion from 13% P₂O₅ would be 13% (P₂O