The purpose of this study was to describe the main traits of the super-sweet maize cultivars ‘UENF SD 08’ and ‘UENF SD 09’, which produced higher yields than the control cultivar in the VCU (Value for Cultivation and Use) test series and proved to be competitive under the agro-climatic conditions of Northern and Northwestern Rio de Janeiro State.
Keywords:
Zea mays L.; plant breeding; yield; shrunken; green corn.
| Environment | UENF SD 08 | UENF SD 09 | Tropical Plus | UENF 506-11 | CV (%) |
|---|---|---|---|---|---|
| Ear yield without husk (t ha-1) | |||||
| Campos 2016/2017 | 11.92a | 10.54ab | 9.53bc | 8.54c | 14.49 |
| Campos 2017/2018 | 12.51a | 11.30ab | 11.36ab | 9.54b | 14.26 |
| Itaocara 2016/2017 | 10.76a | 13.61a | 11.53a | 6.97b | 21.55 |
| Itaocara 2017/2018 | 15.72a | 14.77a | 10.32b | 10.01b | 20.01 |
| Across environments | 12.73a | 12.56a | 10.69b | 8.77c | 17.78 |
| Ear diameter (mm) | |||||
| Campos 2016/2017 | 53.30a | 52.40a | 54.30a | 42.50b | 10.63 |
| Campos 2017/2018 | 52.27b | 51.47b | 55.20a | 41.85c | 3.41 |
| Itaocara 2016/2017 | 49.42b | 51.90b | 54.70a | 41.82c | 4.21 |
| Itaocara 2017/2018 | 51.75b | 55.50a | 49.25bc | 45.75c | 8.23 |
| Across environments | 51.64b | 52.83ab | 53.36a | 42.98c | 5.36 |
| Ear length (cm) | |||||
| Campos 2016/2017 | 17.12a | 16.35a | 16.35a | 14.77b | 5.52 |
| Campos 2017/2018 | 18.25a | 18.20a | 17.52a | 17.95a | 4.69 |
| Itaocara 2016/2017 | 17.50a | 17.32a | 16.50ab | 15.60b | 7.32 |
| Itaocara 2017/2018 | 18.92ab | 19.95a | 17.55bc | 17.50c | 5.69 |
| Across environments | 17.95a | 17.96a | 16.98b | 16.45b | 5.80 |
| Agronomic traits | UENF SD 08 | UENF SD 09 |
|---|---|---|
| Growing degree-days¹ | 900 (~60-65 days) | 915 (~60-65 days) |
| Plant height (m) | 2.38 | 2.52 |
| Ear height (m) | 1.49 | 1.62 |
| Number of ears per plant | 1.1 | 1.1 |
| Number of grain rows | 14 | 14 |
| Husk cover | 1.6 (Good) | 1.6 (Good) |
| Disease resistance² | ||
| Exserohilum turcicum | Moderately Resistant | Resistant |
| Puccinia sorghi | Resistant | Resistant |
| Puccinia polysora | Resistant | Resistant |
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