Maize, Sunflower and Barley Sensitivity to the Residual Activity of Clomazone in Soil

Sensitivity of maize, sunflower and barley to clomazone residues in loamy soil wasassessed in the study using bioassay. Clomazone was applied at a series of concentrationsfrom 0.12 to 12 mg a.i./kg of soil. After 14 days, morphological (shoot height, fresh and dryweight) and physiological (content of carotenoids, chlorophyll a and chlorophyll b) parameterswere measured. The results showed that morphological parameters are not valid indicatorsof clomazone sensitivity. Based on the results showing inhibition of the physiologicalparameters, I50 values were calculated and used to estimate the difference in sensitivitybetween the species tested. Sunflower was the most sensitive species, while the differencein sensitivity between maize and barley was not significant.Nomenclature: clomazone (2-(2-chlorbenzyl)-4,4-dimethyl-1,2-oxazolidin-3-one), maize(Zea mays L.), sunflower (Helianthus annuus L.), barley (Hordeum vulgare L.)