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This study presents results of field experiments conducted to identify factors determining kavalactone content and chemotype in Piper methysticum. The following factors have been studied: (1) the geographical direction of the roots on the plant, (2) the geographical location of the plant, (3) its age, and (4) its organ (roots, stumps, or basal stems). Overall, 185 samples were analysed by HPLC. It...