Although the semiarid and subhumid Chaco regions in northern Argentina have been traditionally considered marginal and
unsuitable for cultivating grain maize for human and livestock nutrition, this crop is increasingly being adopted by local farmers.
The low maize yields observed in the area suggest that climatic constraints limit productivity, while changes in genotypes and
management may be useful to mitigate the effect of these constraints. We analyzed data from 792 farm paddocks with multivariate
mixed models to identify and quantify the main environmental and management constraints to maize’s yield. In addition,
we used the crop model CERES-Maize to assess the potential of a temperate maize hybrid to overcome water constraints. Results
from the mixed models identified the amount of rainfall during February as a primary determinant of maize yield and showed that
tropical hybrids tended to withstand higher temperatures and heat stress better, while temperate hybrids performed better under
conditions of water scarcity. CERES-Maize simulations suggested that temperate maize hybrids have the potential to increase
grain yields from18 to 21 kg ha−1 (14.5% moisture content) for every millimeter of rain during February. This report is the first to
identify alternative roles of temperate and tropical maize hybrids for counteracting climatic risks in the studied subtropical
regions. These findings will provide plant breeders urgently needed information to breed better adapted maize genotypes for
the semiarid and subhumid Chaco.