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Unidade da Embrapa/Coleção:: Área de Informação da Sede - Artigo em periódico indexado (ALICE)
Data do documento: 4-Set-2001
Tipo do Material: Artigo em periódico indexado (ALICE)
Autoria: SANGOI, L.
Título: Nitrogen fertilization impact on agronomic traits of maize hybrids released at different decades.
Edição: 2001
Fonte/Imprenta: Pesquisa Agropecuaria Brasileira, Brasilia, v.36, n.5, p.757-64, maio, 2001.
Idioma: en
Palavras-chave: Hibridos
Rendimento de cultura.
Conteúdo: Genetic selection of maize hybrids is often conducted using high N rates during the breeding cycle. This procedure may either lead to the release of genotypes that present nitrogen luxury consumption or require a stronger N input to accomplish their yield potential. This work was carried out to evaluate the effects of N rates on grain yield and N use efficiency of hybrids cultivated in different decades in Southern Brazil. The trial was performed in Lages, Santa Catarina State. A split plot design was used. Hybrids Ag 12, Ag 28, Ag 303 and Ag 9012, released during the 60's, 70's, 80's and 90's, respectively, were evaluated in the main plots. Nitrogen rates equivalent to 0, 50, 100 and 200 kg ha-1 were side-dressed in the split-plots when each hybrid had six fully expanded leaves. Modern-day hybrid Ag 9012 had higher grain yield than hybrids of earlier eras, regardless of N rates. Under high doses of N, the older hybrids Ag 12 and Ag 28 took up more N and presented higher values of shoot dry matter at flowering than Ag 9012. Nonetheless, they set less grains per ear which contributed to decreasetheir grain yield and N use efficiency.
Thesagro: Absorção
Zea Mays.
NAL Thesaurus: absorption
crop yield
Ano de Publicação: 2001
Aparece nas coleções:Artigo em periódico indexado (AI-SEDE) / Embrapa Informação Tecnológica (SCT)

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