## 3 Results and Discussion
### Mean Squares (MS) of Macro- and Microelements of Yellow-Fleshed Cassava Root  
The effects of genotypes, maturity, and method of sampling on the macro- and microelements of yellow-fleshed cassava roots are presented in Tables 2 and 3. For trial 1, the ANOVA showed that genotype, method, and genotype \(\times\) maturity interaction had a strong significant (\(p<0.001\)) effect on all the macrominerals studied. However, maturity had no significant effect (\(p>0.05\)) on Mg, Na, K, and S. Genotype \(\times\) maturity interaction had a significant effect (\(p<0.001\)) on all the minerals except for Ca. Only Mg, S, and Na showed a significant difference (\(p<0.001\)) for genotype \(\times\) method interaction. For maturity \(\times\) method interaction, only Ca and Na showed a significant difference at (\(p<0.001\)). For the data set 2 trial, there was a highly significant effect (\(p<0.001\)) of genotype and genotype \(\times\) maturity interaction on all the macroelements. Maturity and method had no significant effect (\(p<0.05\)) on Mg and Ca, respectively. Though, genotype \(\times\) method interaction had a significant effect (at \(p<0.001\)) only on Na; maturity \(\times\) method interaction showed no significant effect (\(p<0.05\)) across all the minerals investigated. Thus, for both trials 1 and 2, the independent variables (genotype and maturity) explained the variations observed for all the dependent variables (Ca, Mg, Na, K, P, and S) rather than the basic mean. \begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Statistic**} & **Ca** & **Mg** & **Na** & **K** & **P** & **Su** & **Fe** & **Mn** & **B** & **Cu** & **Mo** & **Co** & **Ni** & **Zn** & **Al** \\ \cline{2-13}  & & & & & & & & & & & & & & & & & & \\ \multicolumn{13}{c}{**Parameters (mg/kg)**} \\ \hline Trial Set 1 & & & & & & & & & & & & & & & & & & \\ Minimum & 440.0 & 370.0 & 15.7 & 4300.0 & 600.0 & 123.7 & 3.69 & 7.39 & 2 & 0.85 & 0.6 & 0.6 & 0.9 & 4.23 & 4 \\ Maximum & 2700.0 & 3000.0 & 2100.0 & 26,000.0 & 3300.0 & 530.0 & 21.91 & 39.99 & 3.8 & 8.49 & 0.7 & 0.7 & 6.08 & 17.31 & 9.6 \\ Mean & 1149.7 & 1184.5 & 228.2 & 12,116.0 & 1233.0 & 290.9 & 8.46 & 16.51 & 2.16 & 3.49 & 0.69 & 0.68 & 2.3 & 8.69 & 5.04 \\ Standard deviation (n \(-\) 1) & 455.0 & 405.0 & 316.8 & 3543.6 & 471.3 & 6.73 & 3.35 & 6.2 & 0.33 & 1.39 & 0.03 & 0.04 & 0.79 & 2.23 & 0.68 \\ Standard error of the mean & 28.8 & 25.6 & 20.0 & 224.1 & 29.8 & 4.3 & 0.24 & 0.44 & 0.02 & 0.1 & 0 & 0.06 & 0.16 & 0.05 \\ Lower bound on mean (95\%) & 1093.0 & 1134.0 & 188.8 & 11,674.6 & 1174.4 & 282.5 & 7.99 & 15.65 & 2.12 & 3.3 & 0.69 & 0.67 & 2.19 & 8.38 & 4.94 \\ Upper bound on mean (95\%) & 1206.3 & 1234.9 & 267.7 & 12,557.4 & 1291.8 & 299.3 & 8.92 & 17.38 & 2.21 & 3.68 & 0.7 & 0.68 & 2.41 & 9 & 5.13 \\ Trial Set 2 & & & & & & & & & & & & & & \\ Minimum & 530.0 & 420.0 & 11.5 & 6300.0 & 540.0 & 146.5 & 4.1 & 4.54 & 2 & 1.78 & 0.6 & 0.6 & 0.9 & 4.52 & 4 \\ Maximum & 5200.0 & 2900.0 & 186.7 & 38,000.0 & 2600.0 & 440.0 & 414.2 & 42.68 & 9.82 & 26.52 & 3 & 3 & 6.48 & 20.52 & 24.57 \\ Mean & 1444.7 & 1219.7 & 39.2 & 17,883.6 & 1112.9 & 271.1 & 9.52 & 13.38 & 2.52 & 4.8 & 0.71 & 0.7 & 1.96 & 9.66 & 5.29 \\ Standard deviation (n \(-\) 1) & 622.5 & 371.6 & 23.4 & 4898.8 & 344.5 & 65.3 & 4.48 & 4.7 & 0.87 & 2.38 & 0.24 & 0.24 & 0.84 & 3.27 & 2.73 \\ Standard error of the mean & 45.3 & 27.0 & 1.7 & 356.3 & 251.4 & 4.7 & 0.36 & 0.38 & 0.07 & 0.19 & 0.02 & 0.02 & 0.07 & 0.27 & 0.22 \\ Lower bound on mean (95\%) & 1355.4 & 1076.4 & 35.8 & 17,180.7 & 1063.4 & 261.8 & 8.8 & 12.63 & 2.38 & 4.41 & 0.67 & 0.66 & 1.82 & 9.13 & 4.85 \\ Upper bound on mean (95\%) & 1354.0 & 1183.0 & 42.6 & 18,586.5 & 1162.3 & 280.5 & 10.24 & 14.14 & 2.66 & 5.18 & 0.75 & 0.73 & 2.09 & 10.19 & 5.73 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Summary of mineral (macro and micro) contents of yellow cassava root genotypes from trial sets 1 and 2. Table 4 showed the effects of genotype, maturity, and method of sampling on the microelements of yellow-fleshed cassava roots.