02362naa a2200337 a 450000100080000000500110000800800410001910000200006024501040008026000090018450001460019352012140033965000200155365000110157365000180158465000160160265000220161865000240164065000090166465000130167365300210168665300260170765300220173365300230175565300360177865300300181465300420184465300280188670000210191477300890193516314442018-06-08       2009    bl uuuu     u00u1 u    #d1 aANDRIOLI, K. G.  aBrazilian maize genotypes sensitivity to water deficit estimated through a simple crop yield model.  c2009  aTítulo em português: Sensibilidade de genótipos brasileiros de milho ao deficit hídrico, estimada por um modelo simples de produtividade.  aThe objective of this work was to determine the sensitivity of maize (Zea mays) genotypes to water deficit, using a simple agrometeorological crop yield model. Crop actual yield and agronomic data of 26 genotypes were obtained from the Maize National Assays carried out in ten locations, in four Brazilian states, from 1998 to 2006. Weather information for each experimental location and period were obtained from the closest weather station. Water deficit sensitivity index (Ky) was determined using the crop yield depletion model. Genotypes can be divided into two groups according to their resistance to water deficit. Normal resistance genotypes had Ky ranging from 0.4 to 0.5 in vegetative period, 1.4 to 1.5 in flowering, 0.3 to 0.6 in fruiting, and 0.1 to 0.3 in maturing period, whereas the higher resistance genotypes had lower values, respectively 0.2?0.4, 0.7?1.2, 0.2?0.4, and 0.1?0.2. The general Ky for the total growing season was 2.15 for sensitive genotypes and 1.56 for the resistant ones. Model performance was acceptable to evaluate crop actual yield, whose average errors estimated for each genotype ranged from -5.7% to +5.8%, and whose general mean absolute error was 960 kg ha-1 (10%).  aAgrometeorology  aModels  aWater balance  aAgricultura  aBalanço Hídrico  aResistência a Seca  aSeca  aZea Mays  aAgrometeorologia  aDados meteorológicos  aDéficit hídrico  aDrought resistance  aGenótipos brasileiros de milho  aModelo agrometeorológico  aModelo de depleção da produtividade  aModelo de produtividade1 aSENTELHAS, P. C.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 44, n. 7, p. 653-660, jul. 2009