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SUMMARY:Assessment of field-grown duckweed biomass by spectral indices
DTSTART;VALUE=DATE-TIME:20260929T160000Z
DTEND;VALUE=DATE-TIME:20260929T161500Z
DTSTAMP;VALUE=DATE-TIME:20260916T130421Z
UID:indico-contribution-2967@cern.ch
DESCRIPTION:Speakers: Dóra Szilágyi (Department of Botany\, Faculty of S
 cience and Technology\, University of Debrecen)\, Viktor Oláh (Department
  of Botany\, Faculty of Science and Technology\, University of Debrecen)\n
 High phenotypic plasticity of duckweeds affects their biomass productivity
 . Reliable estimation of biomass quantity and quality\, hence\, are import
 ant when culturing duckweed outdoors. Spectral proxies\, that is\, indices
  derived from light reflectance and transmittance\, became fundamental in 
 crop production\, but their application on duckweeds has only been reporte
 d scarcely.\nWe aimed at sampling naturally occurring duckweed populations
  and analyzing their biomass with analytical (dry matter and protein conte
 nts) and optical (hyperspectral reflectance and transmittance) approaches 
 due to test applicability of the latter proxies. A total of n=20 duckweed 
 and water samples were analyzed from 10 sites in the Trans-Tisza region (E
 -Hungary) during two sampling campaigns in June and September of 2025.\nTh
 e sampled waters showed wide gradients of N- and P-concentrations\, but bi
 omass dry matter and protein contents showed no significant correlation wi
 th the nutrient availability. Similarly\, neither seasonality\, nor specie
 s-specific patterns were found in biomass traits. Cell phone imaging prove
 d to be reliable in estimating plant biomass (Pearson’s correlation: p<0
 .001) under field conditions. We could not establish link\, however\, betw
 een the reflectance- (e.g. NDVI\, PBI) and transmittance-based (CCI) indic
 es\, and the biomass composition\, respectively. Our results highlight\, t
 hat duckweed biomass traits cannot be predicted mechanistically from spect
 ral indices\, but customized approach is needed for particular application
 s.\nThis research was funded by the NKFIH OTKA grant No. FK 134296\, and w
 as supported by the János Bolyai Research Scholarship of the Hungarian Ac
 ademy of Sciences\, by the University of Debrecen Program for Scientific P
 ublication\, and by the Tempus Public Foundation.\n\nhttps://indico.unina.
 it/event/117/contributions/2967/
LOCATION: Sala Monumentini
URL:https://indico.unina.it/event/117/contributions/2967/
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