engleski

Phytotoxicity of Mesotrione Residues on Sugar Beet (Beta vulgaris L.) in Agricultural Soils Differing in Adsorption Affinity

The phytotoxic effects of mesotrione residues on sugar beet (Beta vulgaris L.) were determined in two agricultural soils (humofluvisol and hipogley) in order to show the relevance of soil characterization in crop rotation practice. Soils were treated with mesotrione at seven rates that simulated the levels of mesotrione in soil considering its field half-life. The visual injury and reduction of fresh weight and total carotenoids were determined during the three-week cultivation in plastic pots under controlled conditions. The Freundlich isotherm model was used to reach the adsorption parameters of mesotrione in both soils. Humofluvisol showed at least twice as less adsorption affinity for mesotrione as hipogley. The effective dose (ED50) of mesotrione for 50 % reduction of sugar beet fresh weight was 5.9 g a. i. ha-1 in hipogley and 4.4 g a. i. ha-1 in humofluvisol. The ED50 for 50 % reduction of total carotenoids was 4.7 g a. i. ha-1 in hipogley and 2.1 g a. i. ha-1 in humofluvisol. The crop rotation have to be performed considering the soil characteristics due to their effect on the bioavailable amount of mesotrione residues in soil resulting in differents level of crop injury in two soils at the same rate.

mesotrione, sugar beet, humofluvisol ; hipogley ; simulated residue carryover ; effective dose

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