### Calculating Fertilizer Costs

Next, calculate the cost per pound of N: $567 ÷ 920 lb N = $0.62/lb N Example B. Superphosphate (0-46-0) has cost an aver-age of $996 per ton. What is the cost per pound of P 2 O 5? First, calculate the pounds of P 2 O 5 in the fertilizer: 2 O 5 Next, calculate the cost per pound of P 2 O 5: $996 ÷ 920 lb = $1.08/lb P 2 O 5 Example C.

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