Interpreting the Rate of Change in Nitrate-Nitrogen in Sugarbeet Petioles1
- J. N. Carter,
- M. E. Jensen and
- S. M. Bosma2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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