Abstract
Using excessive rates of N fertilizer on potatoes in Maine has been a common practice. Excessive N did not significantly increase potato yields above the recommended N application. The impact of N fertilization upon soil solution levels of NO3-N in the B and C soil horizons was compared at three application levels of N. High N resulted in greater levels of NO3-N in the C horizon and the strong possibility of groundwater contamination. There was no apparent change in the NO3-N content of the C horizon during the winter following buckwheat, but there was an increase of NO3-N in this horizon when fall levels beneath potatoes were compared to spring values under buckwheat. After one year of no N application soil solution NO3-N levels in the B horizon returned to amounts that were the same as those receiving no N fertilization for a decade.
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