Chemical Composition and Herbicidal Effects of Essential Oils of Cymbopogon citratus (DC) Stapf, Eucalyptus cladocalyx, Origanum vulgare L and Artemisia absinthium L. cultivated in Morocco

AbstractThis study is designed to examine the chemical composition of the hydrodistillated essential oils obtained from Cymbopogon citratus ( DC) Stapf, Eucalyptus cladocalyx, Origanum vulgare L, and Artemisia absinthium L. GC and GC-MS analysis of the four oils has shown a determination of 18 different components representing 89.3 % of the total oil for Cymbopogon citratus ( DC) Stapf that are neral (29.2 %) and geranial (18.2 %), followed by α-pinene (4.8 %) and myrcene (3.9 %) which are determined as the major compounds of the oil; for Eucalyptus cladocalyx oil there are 29 different components representing 79.0 % of the total oil, the major components are spathulenol (21.6 %) and 1,8-cineole (20.5 %), followed by p-cymene (15.1 %); for Origanum vulgare L. oil there are 25 different components representing 87.6 % of the total oil, the major components are carvacrol (34.0 %) and γ-terpinene (21.6 %), followed by p-cymene (9.4 %) and for Artemisia absinthium L. oil there are 26 different components repre...