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This article in AJ

  1. Vol. 63 No. 5, p. 669-674
     
    Received: Aug 5, 1969
    Published: Sept, 1971


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doi:10.2134/agronj1971.00021962006300050004x

Interpreting the Rate of Change in Nitrate-Nitrogen in Sugarbeet Petioles1

  1. J. N. Carter,
  2. M. E. Jensen and
  3. S. M. Bosma2

Abstract

Abstract

Nitrate-nitrogen in sugarbeet petioles is used to evaluate current N status of sugarbeet crops. Since the NO3-N changes rapidly during the season, better relationships are needed to interpret these data relative to sugarbeet N nutrition.

Sugarbeets (Beta vulgaris, L.) were grown at four N fertilization rates and two irrigation levels to determine the root yield, sucrose percentage, sucrose yield, and N uptake in relation to the NO3-N concentration in the petioles. NO3-N in beet petioles increased to a peak concentration and then decreased exponentially during the two growing seasons on all treatments. The exponential decrease after the peak enables prediction of the NO3-N in the petioles during the remainder of the growing season. This rate of change approach can be used to predict N needs when adding supplemental N for sugarbeets and to characterize the N status of soil-crop systems.

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