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This article in AJ

  1. Vol. 67 No. 5, p. 637-639
     
    Received: Dec 5, 1974
    Published: Sept, 1975


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doi:10.2134/agronj1975.00021962006700050013x

Predicting Sugarbeet Dried Petiole NO3-N by Using Fresh Petiole Juice1

  1. A. D. Halvorson,
  2. G. P. Hartman and
  3. C. A. Reule2

Abstract

Abstract

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.

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