The aim of the study was to examine the effect of foliar application of three herbicidal ionic liquid forms of MCPA ([Arq 2HT][MCPA], [cocoBET][MCPA], [p-DADMA][MCPA]) on chlorophyll a + b content in leaves of spring wheat. Spectrophotometric method was used to measure chlorophyll a + b content 24, 72 and 168 h after fields were treated with Chwastox Extra 300 SL (a.s. MCPA). The data was compared to the control that consisted of a commercial formulation of MCPA as a salt. The field study revealed that a chlorophyll a + b content measured 24 h after spraying with MCPA as a salt was higher by 17%, 72 h by 14% but 168 h it was lower by 16%. The highest decreases in chlorophyll a + b content were observed 168 h after application of Chwastox Extra 300 SL compared to the control and [p-DADMA][MCPA] and they were 16.2% and 17%. However, in comparison with [Arq 2HT][MCPA] and [coco BET][MCPA] the results were similar and amounted to about 2.5%. The results do not confirm a significant impact on the content of photosynthetic pigments in spring wheat. The application of HILs as an alternative herbicide also did not result in adverse chlorophyll a + b decrease.

Celem przeprowadzonych badań była spektrofotometryczna ocena zmian zawartości chlorofilu w liściach pszenicy jarej po 24, 72 i 168 h od momentu zastosowania opryskiwania środkiem Chwastox Extra 300 SL (s.cz. MCPA) oraz wybranymi herbicydowymi cieczami jonowymi HILs ([Arq 2HT][MCPA], [cocoBET][MCPA], [p-DADMA][MCPA]). Poziom chlorofilu a + b w pszenicy jarej po 24 h, na którą zaaplikowano MCPA w postaci soli był wyższy o 17%, a po 72 h o 14%, natomiast po 168 h niższy o 16% w porównaniu do stężenia barwników roślin z obiektów kontrolnych. Największe spadki zawartości chlorofilu a + b zaobserwowano po 168 h dla herbicydu Chwastox Extra 300 SL w porównaniu do kontroli oraz [p-DADMA][MCPA] i wynosiły one 16,2% oraz 17%. Natomiast w porównaniu z [Arq 2HT] [MCPA] i [coco BET][MCPA] uzyskane wyniki były podobne i wynosiły około 2,5%. Dane jakie uzyskano nie potwierdzają istotnego wpływu stosowania MCPA na zawartość pigmentów fotosyntetycznych w pszenicy jarej. Aplikacja HILs jako herbicydu alternatywnego również nie wywołała niepożądanych efektów działania w postaci obniżenia zawartości chlorofilu a + b.

chlorophyll; herbicidal ionic liquids; MCPA; spring wheat; chlorofil; herbicydowe ciecze jonowe; pszenica jara

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