Efficiency of tropical maize genotypes in association with Azospirillum brasilense for grain yield
DOI:
https://doi.org/10.4025/actasciagron.v48.i1.76784Keywords:
Zea mays L.; diazotrophic bacteria; nitrogen; variability; selection; breeding.Abstract
- The use of nitrogen fertilizers in maize crops must be reduced, and a potential alternative is the use of diazotrophic bacteria of the genus Azospirillum. This research aims to characterize the efficiency of the association with Azospirillum brasilense (Az) among maize genotypes on grain yield. Forty-eight experimental single-cross maize hybrids obtained from the cross in a partial diallel scheme between eight and six inbred lines were used. The maize hybrids were evaluated in seven environments, considering the grain yield (GY) without nitrogen (N) topdressing and without Az inoculation, GY with N topdressing and without Az inoculation, GY without N topdressing but with Az inoculation, and the efficiency to Az. The hybrids’ GY varied in the presence of Az, indicating a differential response to the bacteria and confirming that this association enables the selection of more efficient genotypes since some hybrids maintained similar yield levels when N topdressing was replaced by Az inoculation. Low or medium correlation estimates were obtained among the considered traits, indicating a low correspondence between yields under the different conditions and between yields and the efficiency of the association with Az, suggesting that indirect selection for these traits is not efficient. These results indicate that it is possible to select the most efficient maize genotypes.
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