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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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