The efficient use of fertilizer nitrogen (N) is critical for potato production in regions with sandy soils as concerns for groundwater contamination have become more apparent. The interactive effects of different hill shapes and distribution of in-season N fertilizer applications at various timings were evaluatedina3-yearpotato(SolanumtuberosumL.cv.Russet Burbank) field experiment on a sandy soil in central Wiscon- sin. A split-plot design was used with hill shape (standard, shaped-plateau, or pointed) as the main plots and 202 kg N ha −1 divided into two, three, or four applications as the split plots. Broader, flatter hills provided tuber yield increasesof7to10%,tuber sizeandgradeimprovementsof8 to 25 %, and increased tuber N uptake an average of 22 % in some years; however, post-emergence hilling operations neg- atively affected yield and tuber size and grade out in 1 of 2 years. Splitting the N into three in-season applications (emergence, early tuberization, and tuberization+20 days) in- creasedtuber yieldbyabout 4% ortuber sizeby19% inyears where rain increased leaching potential on this sandy soil, but further splitting increased the proportion of small tubers that passed a 5.1-cm screen. This study confirmed that more blocky-shaped hills with only one hilling operation at emer- gence can significantly benefit potato yield and quality, and fertilizer N use efficiency on these sandy soils. Resumen El uso eficiente de fertilizante nitrogenado (N) es critico para la produccion de papa en regiones con suelos arenosos, a medida que se ha vuelto mas aparente la preocupacion sobre la contaminacion del agua del suelo. Se evaluaron los efectos interactivos de diferentes formas del surco y la distribucion de las aplicaciones del fertilizante nitrogenado en el ciclo del cultivo en varios tiempos en un experimento de campo de tres anos en papa (Solanum tuberosum L. var. Russet Burbank) en un suelo arenoso en el centro de Wisconsin. Se uso un diseno de parcelas divididas con la forma del surco (normal, surco aplanado o en punta) como parcelas principales y 202 Kg N ha −1 divididos en dos, tres, o cuatro aplicaciones como las parcelas divididas. Los surcos mas anchos, aplanados, arrojaron incrementos en el rendimiento de tuberculos de 7 a 10 %, mejoras en el tamano del tuberculo y en su calidad de 8 a 25 %, y aumento en la absorcion del N por el tuberculo en un promedio de 22 % en algunosanos;noobstante,lasoperacionesdeaporquedepost-