Data/hora: 01/06/2024 00:59:06

Biblioteca(s): | Embrapa Agricultura Digital; Embrapa Unidades Centrais.
Data corrente: | 23/09/2009
Data da última atualização: | 08/06/2018
Autoria: | ANDRIOLI, K. G.; SENTELHAS, P. C.
Afiliação: | Kleber Gustavo Andrioli; Paulo Cesar Sentelhas.
Título: | Brazilian maize genotypes sensitivity to water deficit estimated through a simple crop yield model.
Ano de publicação: | 2009
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 44, n. 7, p. 653-660, jul. 2009
Idioma: | Inglês
Notas: | Título em português: Sensibilidade de genótipos brasileiros de milho ao deficit hídrico, estimada por um modelo simples de produtividade.
Conteúdo: | The 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%).
Palavras-Chave: | Agrometeorologia; Dados meteorológicos; Déficit hídrico; Drought resistance; Genótipos brasileiros de milho; Modelo agrometeorológico; Modelo de depleção da produtividade; Modelo de produtividade.
Thesagro: | Agricultura; Balanço Hídrico; Resistência a Seca; Seca; Zea Mays.
Thesaurus Nal: | Agrometeorology; Models; Water balance.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/38079/1/44n07a01.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)

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