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Effect of Atonik on selected parameters of chlorophyll a fluorescence (Fv/Fm and PI) in oilseed rape cv. Lisek plants grown under field conditions during the 2007 (A) and 2008 (B) vegetation seasons. Presented data are mean ± SE, n = 24. *Values differ significantly at α = 0.05 as determined by LSD of t-Student test.
