You have a soil test that recommends 90 pounds of P2O5 per acre for your field. Which fertilizer would you select for proper application?

The recommendation of 90 pounds of P2O5 per acre indicates a need for phosphorus fertilization. TSP, or triple super phosphate, has a high phosphorus content, specifically at a rate of 45% phosphorus pentoxide (P2O5). Therefore, if you apply 200 pounds of TSP, it would provide the required 90 pounds of P2O5 since:

200 pounds x 0.45 (45% P2O5) = 90 pounds P2O5.

This makes TSP the ideal choice for meeting the phosphorus requirement outlined by the soil test.

In contrast, UAN solution is primarily a nitrogen source, containing no phosphorus, therefore it would not fulfill the phosphorus needs indicated in the soil test. Muriate of potash is a potassium fertilizer, providing potassium without any phosphorus as well. Both options would fail to address the specific phosphorus recommendation shown in the soil test.