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Effects of Plant Density and Nitrogen Fertility on Purity Components of Sugarbeet¹

The influence of plant density and nitrogen fertility level on purity, sucrose content, and eight other chemical components affecting purity were examined in a 2-year field study of three sugarbeet (Beta vulgaris L.) cultivars. There were significant differences among cultivars for all analyzed characters in one or both years. Between the two N levels, raw juice concentrations of ash, total N, amino N, nitrate, betaine, sodium, and potassium were greater, and chloride, sucrose, and purity lesser under regular N than low (residual) N, though the differences were not always statistically significant. Impurities generally decreased with increasing plant density, and differences among the four densities were significant for most components in both years. These differences were largely but not solely due to differing amounts of N per plant. Of the three main effects analyzed, plant density and cultivar were followed by soil N level with respect to effect on the ten variables measured, and very few first or second or second order interactions were detected.

Key Words: Sucrose • Sugarbeet quality • Beta vulgaris L.

² Research geneticist and plant physiologist, USDA, Crops Research Laboratory, Colorado State Univ., Fort Collins, CO 80523.

Received for publication August 12, 1976.