Plant Soil Environ., 2002, 48(3):107-117 | DOI: 10.17221/4208-PSE

Assessment of metribuzin effects on potatoes using a method of very rapid fluorescence induction

J. Dvořák, I. Remešová
Mendel University of Agriculture and Forestry in Brno, Czech Republic

Effects of increasing doses of the herbicidal preparation Sencor 70 WP (metribuzin a.i.) on selected potato varieties were studied in a field and pot experiments using very rapid fluorescence induction (vrFI). Tuber yield, and in pot experiments a tuber number and characteristics of the aboveground biomass were assessed. The curve of rapid induction goes through the O-J-I-P phases. The parameters Fo, Fv/Fp and rFj were measured. Based on changes in the vrFI parameters in comparison with controls, varieties were ranked according to sensitivity to metribuzin in field experiments. Keřkovské rohlíčky and Ukama were the most sensitive varieties and Impala the least sensitive variety. In pot experiments in the growth chamber, significant decrease in tuber weight vs controls was found in sensitive varieties Keřkovské rohlíčky (in 1998, 0.75 kg.ha-1 Sencor 70 WP decreased tuber weight by 28% and 1.5 kg.ha-1 by 89%) and Ukama (in 1997, at 1.5 kg.ha-1 by 35%). Under stable conditions in the growth chamber, there were lower differences in the rFj parameter in these varieties in comparison with controls than in resistant ones. Based on this finding it can be assumed that the sensitivity of varieties can be determined according to rFj changes under stable ambient conditions.

Keywords: potatoes; metribuzin; chlorophyll fluorescence; tuber yield; aboveground biomass

Published: March 31, 2002  Show citation

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Dvořák J, Remešová I. Assessment of metribuzin effects on potatoes using a method of very rapid fluorescence induction. Plant Soil Environ. 2002;48(3):107-117. doi: 10.17221/4208-PSE.
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