## 3 Results and Discussion
### Essential Oil Chemical Composition
\begin{table}
\begin{tabular}{l l l l l l l l l} \hline \hline \multirow{2}{*}{**Compounds**} & \multirow{2}{*}{**Type of** **Analysis**} & \multirow{2}{*}{**Type of** **Sample**} & \multirow{2}{*}{**Mean (\%)**} & \multirow{2}{*}{**Std.**} & \multicolumn{2}{c}{**95\% Confidence**} & \multicolumn{2}{c}{**ANOVA**} \\  & & & & & & **Interval** & **Test** \\ \hline \(\alpha\)-terpinen-7-al & GC-MS & AHEO & 0.166 & 0.092 & 0.160 & -0.231 & 0.565 & 0.001 \\ \(\gamma\)-terpinen-7-al & GC-MS & AHEO & 0.960 & 0.174 & 0.301 & 0.209 & 1.710 & 0.000 \\ \(\alpha\)-terpiryl acetate & GC-MS & AHEO & 0.240 & 0.128 & 0.222 & \(-0.313\) & 0.793 & 0.001 \\ \(\beta\)-lemene & GC-MS & AHEO & 0.200 & 0.055 & 0.096 & \(-0.039\) & 0.439 & 0.002 \\ E-caryophyllene & GC-MS & AHEO & 0.03 & 0.033 & 0.057 & \(-0.11\) & 0.17 & 0.002 \\ \(\beta\)-epi E-caryophyllene & GC-MS & AHEO & 0.560 & 0.055 & 0.096 & 0.320 & 0.799 & 0.000 \\ \(\delta\)-muvordene & GC-MS & AHEO & 0.050 & 0.050 & 0.086 & \(-0.165\) & 0.265 & 0.001 \\ germacrene D & GC-MS & AHEO & 1.163 & 0.396 & 0.686 & \(-0.540\) & 2.867 & 0.001 \\ \(\alpha\)-muvordene & GC-MS & AHEO & 0.210 & 0.137 & 0.238 & \(-0.383\) & 0.803 & 0.002 \\ \(\delta\)-cadinene & GC-MS & AHEO & 0.050 & 0.050 & 0.086 & \(-0.165\) & 0.265 & 0.000 \\ germacrene D-4-ol & GC-MS & AHEO & 0.070 & 0.070 & 0.121 & \(-0.231\) & 0.371 & 0.001 \\ davanone & GC-MS & AHEO & 2.270 & 0.801 & 1.387 & \(-1.176\) & 5.716 & 0.000 \\ Monoterpene hydrocarbons (\%) & GC-MS & AHEO & 7.926 & 1.024 & 1.775 & 3.516 & 12.336 & 0.001 \\ Oxygenated monoterepenes (\%) & GC-MS & AHEO & 83.336 & 1.210 & 2.096 & 78.129 & 88.543 & 0.000 \\ Total (\%) & GC-MS & AHEO & 95.836 & 1.417 & 2.455 & 89.735 & 101.937 & 0.001 \\ Sesquireprenes & GC-MS & AHEO & 4.590 & 1.073 & 1.859 & \(-0.028\) & 9.208 & 0.004 \\ Aliphatic hydrocarbons & GC-MS & AHEO & 9.946 & 0.813 & 1.408 & 6.448 & 13.445 & 0.001 \\ Ketones & GC-MS & AHEO & 40.193 & 3.248 & 5.627 & 26.214 & 54.172 & 0.011 \\ Esters & GC-MS & AHEO & 28.526 & 0.890 & 1.542 & 24.694 & 32.358 & 0.002 \\ Alcohols & GC-MS & AHEO & 11.576 & 0.994 & 1.723 & 7.296 & 15.857 & 0.001 \\ Ethers & GC-MS & AHEO & 8.570 & 3.335 & 5.776 & \(-5.780\) & 22.920 & 0.001 \\ Aldehydes & GC-MS & AHEO & 1.213 & 0.234 & 0.406 & 0.202 & 2.224 & 0.002 \\ \hline \hline \end{tabular} Values are averages \(\pm\) standard deviation of triplicate analysis. Data obtained were subjected to one-way analysis of variance (ANOVA). S: significant (\(p\) < 0.05). AHEO: Artemisia hero-alba essential oils.  
\end{table} 
Table 2: _Cont._Great variability in the content of constituents was noticed, particularly during the harvest period of June as compared to that of September. The decrease in content was manifested in the case of the \(\beta\)-thujone compound (23 to 12.9%) during the early period of harvest from March to June, and the camphor compound (14.3 to 5.8%) from June to September. As for the two other compounds, 1,8-cineole (1.5 to 11.8%) and chrysanthenone (1 to 14%), they underwent an important increase during the early period from March to June and an extended period of harvest from June to September, respectively. The reduction in the content of camphor from 14.3% (June) to 5.8% (September) partially promoted the formation of chrysanthenone, which appeared in large quantities during the prolonged period of harvest (September) with 14% instead of 1% in June. However, some compounds underwent very few changes in their content, such as \(\alpha\)-thujone (3.5 to 4%), trans \(\beta\)-dihydro-terpineol (7.8 to 6.9%), and cis chrysanthenyl acetate (30 to 26.7%). The chemical variability in the content of constituents might be explained by the following parameters: phenological stage; effect of the climatic conditions of growth (rainfall during the month of March (Spring), an increase in both temperature and hydric stress during June (Summer) and September (Autumn), etc. ); and the season of harvesting [17; 34; 35; 69].