The effect of drying and de-rooting of rhizomes of sweet flag (Acorus calamus Linn.) on its oil and asarone contents were
evaluated. The studied samples were harvest from plants raised at CIMAP, Lucknow India. Alpha, Beta and gama (α, β, and γ)
asarone content of Hydro-distilled essential oil obtained from fresh (FR), dried (DR) and decorticated dried (DRD) rhizomes
were determined using GC/MS. β-asarone was the most dominant constituent in the oils constituting an average of 89.58% in
DRD, 87.24% in FR and 82.95% in DR. α-asarone content was 1.61% in DRD and 1.43% in both DR The essential oil content
was high in dried rhizomes (1.31 %) and removal of root reduced the oil content to the half quantity (0.52%). Results showed
that drying rhizome gave higher oil content and slightly reduced asarone content. The process of de-rooting, which is
commonly practiced by Indian producer, should be abandon to avoid oil loss and increase of its β-asarone content.