Assessing the potential use of two portable chlorophyll meters in diagnosing the nutritional status of plants uri icon

resumo

  • The SPAD-502 and the FieldScout CM 1000 chlorophyll meters were compared in their performance in diagnosing the nutritional status of plants. Leaves of a wide range of greenness were used to push the sensitivity of the tools to their limits. Both devices showed high reproducibility when used by different operators. The SPAD-readings were well-correlated with leaf nitrogen (N) concentrations, since leaves from heavily fertilized plants were not included in the sample population. The FieldScout-readings showed a marked saturation curve with the leaf N concentration, thus it cannot be used as a reliable N nutritional status index. The results also showed that the use of SPAD-502 in the diagnosis of the nutritional status of an orchard requires the establishment of specific critical concentrations for cultivars and sampling dates. The SPAD-502 appeared to have potential in the diagnosis of the nutritional status of the orchard for nutrients other than N.

autores

  • Margarida Maria Pereira Arrobas Rodrigues
  • Rodrigues, Manuel Ângelo Rosa
  • AFONSO, Sandra
  • ARROBAS, MARGARIDA
  • FERREIRA, ISABEL QUEIROS
  • Rodrigues, M. Ângelo
  • Angelo Rodrigues, M.

data de publicação

  • setembro 2017