| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 1.34 MB | Adobe PDF |
Advisor(s)
Abstract(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.
Description
Keywords
FieldScout CM 1000 NDVI Leaf greenness Results reproducibility Leaf N concentration SPAD-502
Pedagogical Context
Citation
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