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Published online 1 September 1975
Published in Agron J 67:637-639 (1975)
© 1975 American Society of Agronomy
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Predicting Sugarbeet Dried Petiole NO3-N by Using Fresh Petiole Juice1

A. D. Halvorson, G. P. Hartman and C. A. Reule2

The amount of time required for petiole NO3-N analysis by established procedures limits the practical application of petiole testing as a tool for sugarbeet (Beta vulgaris L.) management in Montana and other short growing season areas. This study was conducted to determine if fresh petiole juice NO3-N could be used to predict dried petiole NO3-N, thereby reducing analysis time.

Petiole juice NO3-N was significantly correlated (r = 0.985) with dried petiole NO3-N when the NO3-N concentration was determined by steam distillation. Expressing the juice petiole NO3-N concentration on a dry weight basis slightly improved the correlation (r = 0.994).

To accurately determine petiole NO3-N concentrations using petiole juice, water content should be considered; but for routine testing and practical purposes, water content differences caused by seasonal and/or soil N fertility levels could possibly be estimated or disregarded without serious error in data interpretation.

The petiole juice method of determining petiole NO3-N concentration requires less time, equipment, expense, and space than other established procedures.

Key Words: Tissue testing • Sugarbeet N Fertilizer management • Juicer • Sugarbeet quality • Extracting plant sap • Beta vulgaris L.

1 Contribution from the Western Region, USDA-ARS, and Montana Agric. Exp. Stn., Sidney, Mont., Journal Series No. 533. This work was supported in part by the Holly Sugar Corp. and the Great Western Sugar Co.

2 Soil scientist, USDA-ARS; associate soil scientist, Eastern Agric. Res. Center, MSU; and biological lab. technician, USDA-ARS, respectively, P. 0. Box 1109, Sidney, MT 59270.

Received for publication December 5, 1974.




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The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1975 by the American Society of Agronomy.