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Timing and Rate of Fertilizer Nitrogen for Sugarbeets Related to Nitrogen Uptake and Pollution Potential¹

ABSTRACT

Nitrogen (N) uptake by sugarbeets (Beta vulgaris L.) from fertilizer and soil, as related to time and rate of application, was evaluated at Davis, California, in two field experiments utilizing ¹⁵N-deleted ammonium sulfate. There were no significant differences in root, top, or sugar yield when fertilizer N (135 kg/ha) was applied at planting, at thinning, split equally between thinning and layby, or split equally between planting, thinning, and layby. Also, there were no substantial differences in soil or fertilizer N in tops and roots in response to these dates of application.

Fertilizer N recovery was 47% when 112 kg N/ha were applied to achieve maximum sugar yield. Roots removed as much N as that applied and tops contained an additional 105 kg N/ha. When applied N was 2.5 times the amount required for maximum sugar yield, tops and roots contained almost as much N as applied. The sugarbeet crop, carefully fertilized, has potential for alleviation of nitrate pollution of ground water.

Key Words: ¹⁵N-depleted fertilizer • nitrogen tracer • fertilizer efficiency

¹ Contribution from the Dep. of Agronomy and Range Sci. and the Dep. of Land, Air and Water Resour., Univ. of California, Davis, CA 95616. This work was supported by the California Beet Growers Assoc., the California sugarbeet processors and by NSF GI-34733 XI.

² Extension Agronomist and Professor of Soil Microbiol., Univ. of California, Davis, and Director, Joint FAO/IAEA Div., Vienna, Austria, respectively.

Received for publication September 1, 1977.

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