A farmer applies $1255kg$ of a fertilizer that contains $10\mathrm{.}0\%$ nitrogen to his fields each year. Fifteen percent $(15\mathrm{.}0\%)$ of the fertilizer washes into a river that runs through the farm.

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If the river flows at an average rate of $0\mathrm{.}490$ cubic feet per second, what is the additional concentration of nitrogen $($expressed in milligrams of nitrogen per liter$)$ in the river water due to the farmer's fertilizer each year?

$m\frac{g}{L}$