Potato Research

, Volume 36, Issue 4, pp 301–308 | Cite as

Hand-held chlorophyll meter: a promising tool to assess the nitrogen status of potato foliage

  • J. Vos
  • M. Bom
Article

Summary

A field experiment with potato (Solanum tuberosum L., cv. Vebeca) was conducted on a sandy soil near Wageningen (52° North) in 1992. The treatments included a zero-nitrogen control and combinations of three amounts of nitrogen, viz. 110, 180 and 250 kg N ha−1, and splitting of the N dose in one (early May), two (early May and June) or three (early May, June, July) applications. The chlorophyll content of the uppermost fully grown leaves was assessed with a SPAD-502 chlorophyll meter (Minolta, Osaka, Japan) throughout the season. The pattern of change with time in SPAd-values differed between treatments. SPAD-502 readings correlated well with laboratory measurements of the chlorophyll content and with the nitrogen concentration in leaves (r2>0.95). Data on the nitrate concentration in petiole sap (included as a reference) showed that this variable responded much more to split nitrogen applications than the SPAD-value. Future research will need to consider other factors which may affect the chlorophyll content of the foliage.

Additional keywords

colour petiole nitrate 

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Copyright information

© Kluwer Academic Publishers 1993

Authors and Affiliations

  • J. Vos
    • 1
  • M. Bom
    • 1
  1. 1.Department of AgronomyWageningen Agricultural UniversityWageningenthe Netherlands

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