The analysis of variance of studied traits is given in Table 2. The results showed a significant effect of irrigation levels on all traits at 1% probability level, a significant effect of phosphorus levels on essential oil percentage, chamanzulene, bfarenzn, bisabolo oxide A and bisabolo oxide B contents and essential oil yield at 1% probability level and a significant
effect of zinc levels on essential oil percentage, chamanzulene content and essential oil yield at 5% probability level. Interaction between drought stress and phosphorus had a significant effect on prolin and bisabolo oxide A contents at 5% and 1% probability level, respectively. Interaction between drought stress and zinc had a significant effect on bisabolo
oxide A content at 1% probability level and on chamanzulene content and essential oil yield at 5% probability level.