A nutrient management plan must account for manure application rates. A beef feedlot manure has 30 lbs total N per ton. If 50% of the N is ammonium (NH4-N) with a volatilization loss of 25%, what is the plant-available N from ammonium per ton of manure?
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A
7.5 lbs/ton
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B
11.25 lbs/ton
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C
15 lbs/ton
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D
22.5 lbs/ton