Abstract
Furrow irrigation poses particular challenges for optimizing sugarbeet (Beta vulgaris) nitrogen uptake. The purpose of this research was to evaluate six N sources available to sugarbeet producers, including three dry products (urea and two enhanced-efficiency urea products) and three fluid products [ureaammonium-nitrate (UAN)-32 and two enhanced-efficiency fluid products]. Products were evaluated at two application timings (split preplant and side dress, and all preplant) and two rates (typical grower rate and soil-test-based rate). Results show subtle but possibly economically important differences in sugar yield, with knife-injected fluid UAN-based products performing best. These fluid N sources performed as well at soil-test-based N rates as at the higher N rates.
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