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This article in AJ

  1. Vol. 69 No. 1, p. 85-88
     
    Received: Feb 23, 1976


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doi:10.2134/agronj1977.00021962006900010022x

Prediction of Late Season Nitrate-Nitrogen Content of Sugarbeet Petioles1

  1. J. F. Giles,
  2. A. E. Ludwick and
  3. J. O. Reuss2

Abstract

Abstract

Nitrate nitrogen levels in sugarbeet (Beta vulgaris L.) petioles have been used as an aid to diagnose nutritional status of the plants. The purpose of this study was to evaluate a theoretical approach to the prediction of the rate of change in NO3-N concentration of sugarbeet petioles. Petiole samples were collected from sugarbeet N fertilizer trials conducted over a 2-year period on cooperator farm sites in central and eastern Colorado. Results showed the NO3-N concentration of sngarbeet petioles through the growing season decreased exponentially. The rate of change was a function of soil NO3-N content (0-120 cm depth) measured in the spring and the amount of N applied as preplant fertilizer. Calculation of the rate of change with this function and the measurement of one early petiole sample enables the prediction of the NO3-N concentration during the remainder of the growing season.

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