Abstract
Potato leaf, stem and tuber samples have been analysed for nitrogen concentration [N], by three methods; Kjeldahl digestion, Dumas combustion, and near infra-red reflectance (NIR) spectroscopy. Models to estimate [N] from NIR have been developed using either Kjeldahl or Dumas for calibration. Estimates of [N] from all three methods, are highly correlated. However, [N] measurements by Kjeldahl and Dumas are not in agreement. Kjeldahl has a recovery rate of ca. 98% organic-N and variable recovery of inorganic-N. Dumas measures both organic- and inorganic-N with a recovery rate of 100%. The suitability of Kjeldahl as an analytical technique must be questioned when NIR methods are available which will give accurate [N] values quickly, safely and cheaply.
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© 1993 Springer Science+Business Media Dordrecht
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Young, M.W., Davies, H.V., MacKerron, D.K.L. (1993). Comparison of techniques for nitrogen analysis in potato crops. In: Fragoso, M.A.C., Van Beusichem, M.L., Houwers, A. (eds) Optimization of Plant Nutrition. Developments in Plant and Soil Sciences, vol 53. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2496-8_2
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DOI: https://doi.org/10.1007/978-94-017-2496-8_2
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