Appropriate rate and timing of N fertilizer inputs are critical to profitable sugar beet production. Significant N loss via leaching and denitrification can occur when N fertilizer is applied too early, but applications too late in the growing season can result in reduced canopy development and subsequent delayed root growth, ultimately resulting in reduced yields. The objective of this research was to evaluate the performance of delayed-release N fertilizer sources, alone and in combinations with conventional N fertilizers, on sugar beet yield and quality (clear juice purity, sucrose content, amino N). Fertilizer sources evaluated included two conventional fertilizers, urea and urea ammonium nitrate solution, and two delayed-release fertilizers, polymer-coated urea and liquid polymer N. Treatments at two locations were arranged in a RCBD with four replications and included a no-N control and seven source/combinations at two N rates (90 and 123 kg N ha^-1). Soil samples (0-15 cm) were collected on 10-14 day intervals throughout the growing season for evaluation of soil N status. Sugar beets were harvested for determination of root yield and subsamples were analyzed for quality components including recoverable sucrose, clear juice purity, and amino N.