Table 4.
Variance components and likelihood ratio test results for general combining ability (GCA) and specific combining ability (SCA) effects for weevil severity (WED, scale 1–9), weevil incidence (WI, %), storage root yield (SRY, t/ha), and dry matter content (DMC, %) across four environments.
| Variance components | Traits | |||
|---|---|---|---|---|
| WED | WI | SRY | DMC | |
| GCAf | 0.02 | 4.68* | 1.05** | 0.53 |
| GCAm | 0.00 | 1.70 | 0.00 | 0.00 |
| GCAf × Environment | 0.02* | 3.61 | 0.65* | 0.36** |
| GCAm × Environment | 0.00 | 0.47 | 0.24* | 0.15 |
| SCA | 0.01 | 0.00 | 0.42* | 0.54* |
| SCA × Environment | 0.01 | 1.82 | 0.00 | 0.00 |
| Env_Abi2019A | 4.52 | 715.96 | 36.22 | 22.11 |
| Env_Abi2019B | 3.54 | 764.38 | 22.33 | 34.71 |
| Env_Ngetta2019B | 3.17 | 671.92 | 90.88 | 21.33 |
| Env_Ngetta2020A | 2.92 | 221.57 | 205.24 | 36.97 |
*
Significant at p ≤ 0.05.
**
Significant at p ≤ 0.01. Residual variances presented separately for each of the four environments.