Abstract: Nitrification inhibitors Dicyandiamide (DCD) and Nitrapyrin were tested with field-grown potato (Solanum tuberosum) on sandy Coastal Plain soils in northern Florida. These compounds are intended to reduce leaching of applied nitrogen fertilizer by inhibiting the bacterial transformation of ammonium nitrogen to nitrate nitrogen, which is much more prone to leaching. Theoretically, this should increase crop yields and reduce detrimental environmental effects of nitrogen fertilizers. In these trials, nitrification was inhibited but yields of chipping potato was generally not increased. Dissertation Discovery Company and University of Florida are dedicated to making scholarly works more discoverable and accessible throughout the world. This dissertation, "Nitrification Inhibitor Effects on Potato Yields and Soil Inorganic Nitrogen" by Harris Warthman Martin, was obtained from University of Florida and is being sold with permission from the author. A digital copy of this work may also be found in the university's institutional repository, IR@UF. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation.