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- W2000217421 abstract "The initial phase of the chlorophyll fluorescence induction kinetics provides information about the action of herbicides. Measurements on algae and on wheat show a change in the curve shape in the first 60 ms when the herbicides DCMU, atrazine, and terbuthylazine are applied with concentrations between 0.5-200 (mu) g/l. As the measurements are non-destructive, repeated measurements at one site of the wheat leaf can monitor the increasing herbicide concentration after the application to the roots. An empirical parameter B<SUB>r</SUB> derived from the fit of the initial phase with two exponential functions estimates the degree of the inhibition induced by the herbicide. The measured curves can also be analyzed in terms of the usual PS-model. This yields the parameter B<SUB>b</SUB> which estimates the relative contribution of the blocked PS-centers to the fluorescence. As both parameters, B<SUB>b</SUB> and B<SUB>r</SUB>, exhibit an equivalent course in their dependence on the herbicide concentration, they scale the relative portion of the blocked PS-centers for a given herbicide concentration." @default.
- W2000217421 created "2016-06-24" @default.
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- W2000217421 date "1997-05-23" @default.
- W2000217421 modified "2023-09-24" @default.
- W2000217421 title "<title>Chlorophyll fluorescence induction kinetics as a tool to determine the herbicide effect on algae and leaves</title>" @default.
- W2000217421 doi "https://doi.org/10.1117/12.274740" @default.
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