Abstract :
[en] Some phenolic compounds are proposed as good indicators of crop
nitrogen status (CNS). This research compared the use of leaf flavonoid
content (LFC) as a potential indicator for evaluating potato CNS with other
recognized indicators linked to leaf chlorophyll content (LCC). Three-year
trials were conducted in Belgium on two potato cultivars including
increasing nitrogen rates. Optical sensors (Dualex, Multiplex, Hydro
N-tester, Cropscan) were used to evaluate LFC and/or LCC. Plant tissue
samples were analyzed to calculate the biomass nitrogen concentration
and the nitrogen nutrition index. The indicators were evaluated based on
four criteria: the sensitivity, the earliness of the diagnosis, the accuracy,
and the specificity. Apart from the low specificity to nitrogen, which can
be improved by the use of a within-field reference plot, the LFC (combined
with LCC or individually) matched the required criteria and could be
suggested as a valuable indicator for assessing potato CNS.
Funders :
SPW Agriculture, Ressources naturelles et Environnement - Service Public de Wallonie. Agriculture, Ressources naturelles et Environnement
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