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Nitrogen Needs of Sugarbeet Produced with Reduced-Tillage System

USDA-ARS, P.O. Box 400, Akron, CO 80720
Montana Agric. Exp. Stn., Sidney, MT 59270

^* Corresponding author

Recent studies have shown that sugarbeet (Beta vulgaris L.) can be produced with reduced-tillage systems; however, the effects that reduced-tillage systems may have on N requirements of sugarbeet have not been studied. Therefore, field studies were conducted on a furrow-irrigated silty clay loam soil (Typic Argiboroll) to determine N requirements for optimum sucrose production by sugarbeet grown with reduced-tillage systems. Tillage treatments were conventional tillage (CT), strip tillage (ST), and no-tillage (NT). Four N rates of 0, 56, 112, and 168 kg/ha in 1980 and 1981, and 0, 84, 140, and 196 kg/ha in 1982 were imposed on each of the tillage treatments in a split-plot design. Fertilizer N was applied prior to establishment of tillage treatments In the fall prior to spring sugarbeet planting. Sucrose yields were ST > NT = CT. Application of N significantly increased root yield as well as gross and recoverable sucrose yields, but reduced sucrose content of the sugarbeet root and clear juice purity of all tillage treatments similarly. Except for clear juice purity, tillage x N interactions were not significant when averaged over 3 yr. Therefore, N recommendations formerly developed for yield and quality relationships for sugarbeet produced with conventional tillage can be used to make N recommendations for sugarbeet produced with reduce-tillage systems.

Received for publication August 24, 1987.