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Orientador(es)
Resumo(s)
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.
Descrição
Palavras-chave
FieldScout CM 1000 NDVI Leaf greenness Results reproducibility Leaf N concentration SPAD-502
Contexto Educativo
Citação
Afonso, Sandra; Arrobas, Margarida; Ferreira, Isabel Q.; Rodrigues, M.A. (2018). Assessing the potential use of two portable chlorophyll meters in diagnosing the nutritional status of plants. Journal of Plant Nutrition. ISSN 0190-4167. 41:2, p. 261–271