Selection of maize top-crosses for different nitrogen levels through specific combining ability
DATA DE PUBLICAÇÃO
ABSTRACT An alternative to increase yield without raising the production costs and minimizing the dependence of agricultural inputs is the development of maize genotypes presenting high nitrogen (N) use efficiency under low N level conditions. Thus, the objective of this study was to estimate the specific combining ability of maize top-crosses under high and low nitrogen (N) conditions and to select high-yielding hybrids for both conditions. The grain yield of 110 top-cross hybrids was evaluated in 2012 in two locations in the Brazilian Midwest. Partial diallel analysis was performed with the adjusted means of each of the individual top-cross analyses. Specific combining ability (SCA) of the hybrids and their interaction with N levels was estimated for each location. The mean grain yield of the 11 hybrids selected by the highest SCA estimates for high and low N was higher than the controls mean in approximately 330 and 241 kg∙ha-1. These results demonstrate that the selection for each environment was efficient and reveals the possibility of developing new hybrids for the Brazilian Cerrado region.
- Selection of parents for low nitrogen stress through the combining ability of maize partially inbred lines
- Combining ability of maize grain yield under different levels of environmental stress.
- Combining ability for nitrogen use in a selected set of inbred lines from a tropical maize population.
- Combining ability of twelve maize populations.
- Genetic Combining Ability of Light and Heavy Inbred Lines in Single Crosses of Poultry