Evaluation of two transmittance meters in estimating chlorophyll and nitrogen concentrations in grapevine cultivars
Abstract
Two transmittance-based chlorophyll meters (SPAD-502 and CCM-200) were evaluated in estimating chlorophyll (Chl) and nitrogen (N) levels in grapevine leaves. The study was conducted in a fertilization experiment [0 (N0), 60 (N1) and 120 (N2) kg N/ha] during the summer 2009, in two commercial vineyards located in Northern Greece and planted with cvs Cabernet-Sauvignon and Xinomavro (Vitis vinifera L.). When data were pooled over cultivars and samplings, leaves of N2 vines had the highest N and Chl content, as well as SPAD and CCM readings, followed by the respective values of N1. However, neither of the devices could detect the seasonal decline in leaf N and Chl content. Significant relationships between extracted Chl and measured leaf N were found in both cultivars. A strong linear function related SPAD and CCM readings in both cultivars. Total Chl and N were strongly correlated with SPAD and CCM readings in Cabernet Sauvignon (p<0.001) while relationships were poor for SPAD and not significant for CCM in Xinomavro. The results suggest that non-destructive chlorophyll estimations by transmittance-based meters are not applicable in all situations without specific estimations by transmittance-based meters are not applicable in all situations without specific calibrations necessary to improve their utility and accuracy over grapevine cultivars.
DOI:
Issue: Terroir 2010
Type: Article
Authors
(1) Boutari S.A., Goumenissa Winery, 613 00 Goumenissa, Greece
(2) Laboratory of Viticulture, Aristotle University of Thessaloniki, 541 24, Thessaloniki, Greece
(3) NAGREF, Cotton and Industrial Plants Institute, 574 00 Sindos, Greece
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Keywords
SPAD-502, CCM-200, chlorophyll, nitrogen, grapevine, N fertilization