Phosphatic fertilizer analysis:\nA fertilizer labeled 16% P2O5 would most likely be which product grade?

Introduction / Context:
Fertilizer grades for phosphate are often expressed as percent P2O5. Recognizing typical analysis values helps identify the product. Single superphosphate (SSP) has substantially lower P2O5 content than triple superphosphate (TSP) or ammonium phosphates (MAP/DAP), making it the best match to a 16% P2O5 label among common products.

Given Data / Assumptions:

• Target analysis ≈ 16% P2O5.
• Product candidates include SSP, TSP, DCP, and ammonium phosphates.
• Standard commercial specifications are assumed.

Concept / Approach:
Typical P2O5 analyses: SSP about 16–20% (often near 16–18% depending on process and moisture), TSP about 44–46%, DAP about 46% P2O5 with high N content, and DCP products are substantially higher than 16% and used more in feed/phosphate blends. Therefore, the fertilizer closest to 16% P2O5 is SSP.

Step-by-Step Solution:

Verification / Alternative check:
Product datasheets and national fertilizer standards list SSP around 16% available P2O5, confirming the match.

Why Other Options Are Wrong:

• TSP/DAP: far higher P2O5 content than 16%.
• DCP: not typically marketed as a 16% P2O5 fertilizer; higher analysis.
• None of these: incorrect since SSP fits.

Common Pitfalls:
Confusing P2O5 percent with elemental phosphorus percent; P2O5 values are higher numerically than elemental P for the same product.

Final Answer:
Single superphosphate (superphosphate, SSP).