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The aim of the study was to examine the effect of spraying two herbicidal ionic liquid forms of MCPA (HILs – [Etq O-12][MCPA], [DDA][MCPA]) on chlorophyll a + b content in leaves of spring barley (Hordeum vulgare L.). Spectrophotometric method was used to measure chlorophyll a + b content 24 and 72 h after fields were sprayed. The data was compared to controls that consisted of the treatments using a commercial formulation of MCPA as a salt or ester. The field studies revealed that after 24 h of MCPA as a salt spraying chlorophyll a + b content in spring barley was lower by 12% and after 72 h by 18%. The application of MCPA as an ester lowered the chlorophyll a + b amount by just 9%, as a HILs resulted in decrease by about 3% compared to control plots. The results do not confirm a significant impact on the content of photosynthetic pigments in spring barley, but they show that the application of HILs as an alternative herbicide can reduce the undesirable effects of MCPA.

Chlorophyll a + b content in leaves of spring barley after MCPA and selected HILs application