## 3 Results and Discussion
### Effect of Growing Medium on the Growth and Yield
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c c c c c c} \hline \hline \multicolumn{1}{c}{\multirow{2}{*}{\(\mathbf{C\times GM\)}}} & \multicolumn{3}{c}{**Leaves**} & \multicolumn{3}{c}{**Plant Height**} & \multicolumn{3}{c}{**Root**} & \multicolumn{3}{c}{**Stem**} & \multicolumn{3}{c}{**Leaves**} \\  & \multicolumn{3}{c}{**(n\({}^{\circ}\))**} & & \multicolumn{3}{c}{**(cm)**} & & \multicolumn{3}{c}{**(mg d.w.)**} & & \multicolumn{3}{c}{**(mg d.w.)**} & & \multicolumn{3}{c}{**(mg d.w.)**} & \\ \hline IMP \(\times\) TC & 3.5 \(\pm\) & 0.6 & e & 7.6 \(\pm\) & 0.7 & e & 16.9 \(\pm\) & 2.6 & c & 12.2 \(\pm\) & 0.3 & e & 44.8 \(\pm\) & 2.5 & d \\ IMP \(\times\) C1-60 & 4.2 \(\pm\) & 0.6 & a & 8.4 \(\pm\) & 1.1 & bcd & 21.1 \(\pm\) & 1.5 & abc & 15.4 \(\pm\) & 2.2 & a-e & 58.9 \(\pm\) & 7.9 & bcd \\ IMP \(\times\) C1-30 & 3.8 \(\pm\) & 0.4 & cde & 7.3 \(\pm\) & 0.7 & e & 18.8 \(\pm\) & 1.3 & bc & 11.3 \(\pm\) & 1.4 & e & 48.8 \(\pm\) & 0.4 & d \\ IMP \(\times\) C2-60 & 4.1 \(\pm\) & 0.6 & ab & 7.8 \(\pm\) & 1.0 & de & 17.1 \(\pm\) & 1.2 & bc & 12.6 \(\pm\) & 1.8 & de & 49.6 \(\pm\) & 5.7 & d \\ IMP \(\times\) C2-30 & 4.1 \(\pm\) & 0.5 & abc & 7.4 \(\pm\) & 0.6 & e & 16.9 \(\pm\) & 4.4 & c & 13.1 \(\pm\) & 1.0 & ce & 53.4 \(\pm\) & 3.5 & cd \\ IMP \(\times\) C3-60 & 4.0 \(\pm\) & 0.4 & a-d & 7.2 \(\pm\) & 0.7 & e & 16.9 \(\pm\) & 4.1 & c & 14.9 \(\pm\) & 1.1 & b-e & 47.7 \(\pm\) & 0.7 & d \\ IMP \(\times\) C3-30 & 3.8 \(\pm\) & 0.4 & b-e & 7.4 \(\pm\) & 0.6 & e & 18.9 \(\pm\) & 5.7 & bc & 13.3 \(\pm\) & 1.7 & cde & 54.8 \(\pm\) & 5.1 & cd \\ VDI \(\times\) TC & 4.0 \(\pm\) & 0 & a-d & 9.2 \(\pm\) & 1.0 & a & 32.6 \(\pm\) & 4.4 & a & 11.3 \(\pm\) & 1.9 & e & 77.7 \(\pm\) & 7.2 & ab \\ VDI \(\times\) C1-60 & 4.0 \(\pm\) & 0.2 & a-d & 8.8 \(\pm\) & 0.8 & abc & 28.6 \(\pm\) & 8.0 & abc & 17.5 \(\pm\) & 2.8 & a-d & 70.3 \(\pm\) & 9.4 & abc \\ VDI \(\times\) C1-30 & 3.7 \(\pm\) & 0.5 & de & 8.7 \(\pm\) & 0.9 & abc & 22.3 \(\pm\) & 2.0 & abc & 18.0 \(\pm\) & 0.1 & abc & 70.5 \(\pm\) & 8.7 & abc \\ VDI \(\times\) C2-60 & 4.0 \(\pm\) & 0.2 & a-d & 9.1 \(\pm\) & 0.9 & ab & 29.3 \(\pm\) & 4.0 & ab & 20.3 \(\pm\) & 1.4 & a & 80.7 \(\pm\) & 13 & a \\ VDI \(\times\) C2-30 & 4.1 \(\pm\) & 0.3 & ab & 9.3 \(\pm\) & 0.7 & a & 28.8 \(\pm\) & 5.6 & abc & 18.5 \(\pm\) & 1.1 & ab & 83.3 \(\pm\) & 5.2 & a \\ VDI \(\times\) C3-60 & 4.0 \(\pm\) & 0.2 & a-d & 8.3 \(\pm\) & 0.8 & cd & 22.3 \(\pm\) & 4.2 & abc & 13.5 \(\pm\) & 3.1 & b-e & 63.4 \(\pm\) & 4.0 & a-d \\ VDI \(\times\) C3-30 & 3.9 \(\pm\) & 0.3 & a-d & 8.3 \(\pm\) & 0.6 & cd & 19.8 \(\pm\) & 1.9 & bc & 13.0 \(\pm\) & 0.7 & cde & 50.3 \(\pm\) & 7.6 & d \\ Significance & *** & & & & & *** & & & *** & & & *** & & \\ \hline \hline \end{tabular}  
* The values are means \(\pm\) standard deviation. Within each column, different letters indicate significant differences according to [PERSON]’s test at \(p\leq\) 0.05. IMP: Imperial lettuce cv; VDI: Verde d’Inverno lettuce cv; TC: Peat-based substrate; C1-60: 60% Compost 1 + 40% Peat; C1-30: 30% Compost 1 + 70% Peat; C2-60: 60% Compost 2 + 40% Peat; C2-30: 30% Compost 2 + 70% Peat; C3-30: 30% Compost 3 + 70% Peat; C3-60: 60% Compost 3 + 40% Peat; not significant; significance *: \(p<\) 0.05; **: \(p<\) 0.001.  
\end{table} 
Table 6: The main effect of the cultivar (C) and growing medium (GM) interaction on the number of leaves, plant height, and root, stem, and leaves dry weight per plant at 43 days after sowing.