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Álvaro de Oliveira Santos, Renzo Garcia Von Pinho, Vander Fillipe de Souza, Lauro José Moreira Guimarães, Márcio Balestre, Luiz Paulo Miranda Pires and Carlos Pereira da Silva

Abstract: Water deficit stress is the abiotic factor with the highest impact on
crop yield. The objective of this study was to evaluate grain yield (GY), the
anthesis-silking interval (ASI) and drought tolerance indices in maize hybrids.
We evaluated GY and the ASI of 86 hybrids under two moisture levels (normal
irrigation and water stress) for three consecutive years. The stress susceptibility
index, water stress tolerance, drought resistance coefficient, drought resistance
index, stress tolerance index and harmonic mean were evaluated. There were
significant hybrid x environment interactions for GY and the ASI. Differences
in the ASI among environments ranged from 0 to 5 days. The hybrids P3862,
1I873, 1I923, 1I862 and 1J1211 showed high GY, associated with the highest
drought tolerance indices. The stress tolerance index and harmonic mean indices
can be used to identify higher-yielding maize hybrids in environments with and
without water restriction.

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