The video below gives an explanation of how Nitrogen is deposited back to the soil every fall as the leaves fall from Miscanthus back to the soil. Unlike food crops, which extract Nitrogen from the soil, as energy crops deposit Nitrogen, this reduces their fertilizer demands.
As stated this does not completely resolve the need for fertilizers, however it does reduce the amount needed. Remember, once biomass has been burnt the ash can be used as a soil amendment to get Nitrogen back into the soil. Bio char produced from gasification, is a particularly good soil adamant.
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