Data/hora: 05/06/2024 08:48:56

Provedor de dados: | 86
País: | Brazil
Título: | Nitrogen fertilization impact on agronomic traits of maize hybrids released at different decades
Autores: | Sangoi,Luís; Ender,Márcio; Guidolin,Altamir Frederico; Almeida,Milton Luiz de; Konflanz,Valmor Antônio.
Data: | 2001-05-01
Ano: | 2001
Palavras-chave: | Zea mays; Hybrids; Absorption; Crop yield.
Resumo: | 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 decrease their grain yield and N use efficiency.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001000500005

Editor:

Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira

Relação: | 10.1590/S0100-204X2001000500005
Formato: | text/html
Fonte: | Pesquisa Agropecuária Brasileira  v.36 n.5 2001
Fonte: | info:eu-repo/semantics/openAccess