Assessment of metribuzin effects on potatoes using a method of very rapid fluorescence induction
Dvorak, J. | Remesova, I. (Mendelova Zemedelska a Lesnicka Univ., 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. Kerkovske rohlicky 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 Kerkovske rohlicky (in 1998, 0.75 kg/ha Sencor 70 WP decreased tuber weight by 28 % and 1.5 kg/ha by 89 %) and Ukama (in 1997, at 1.5 kg/ha 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.
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