Data/hora: 18/06/2024 17:14:30

Biblioteca(s): | Embrapa Milho e Sorgo.
Data corrente: | 30/07/1998
Data da última atualização: | 14/06/2018
Autoria: | SANTOS, M. X.; CARVALHO, H. W. L.; LEITE, C. E. P.; ANDRADE, R. V.; VASCONCELLOS, C. A.
Afiliação: | EMBRAPA-CNPMS.
Título: | Evaluation and selection of tropical maize (Zea mays L.) accessions in low-fertility soils with phosphorus limitations.
Ano de publicação: | 1998
Fonte/Imprenta: | Plant Genetic Resources Newsletter, Rome, n. 113, p. 17-21, 1998.
Idioma: | Inglês
Conteúdo: | Extensive areas in Brazil have severe problems of mineral deficiencies and maize is a genetically diverse cereal species that represents an important option to help maintain the sustainability of agriculture in these areas. The objective of the present study was to characterize and evaluate maize germplasm in low-fertility soil with severe phosphorus (P) limitations and to select promising accessions to be incorporated into breeding programmes. The 269 accessions collected in northeastern Brazil, between 1980 and 1985, were evaluated in two experiments during the 1994/95 season in two locations. Varieties BR 106 and BR 136, selected under conditions of good soil fertility, were added as between-plot checks. The soil was not fertilized and none of the experiments was stressed with drought. The results of combined analysis of variance showed significant differences between treatments (P<0.01) and significant accessions x locations interaction in the trials with accessions from different sites, but not in the trials with accessions collected in the same site in the northeastern region. In both locations several accessions were more productive than the best check, indicating that selection in good environments may not be efficient in improving performance in low-fertility environments. The wide range of variation exhibited by the accessions indicates that it is possible to select and utilize genetic resources in less-developed regions in order to maintain sustainable agriculture.
Thesagro: | Fósforo; Milho.
Categoria do assunto: | W Química e Física
Registro original: | Embrapa Milho e Sorgo (CNPMS)
Exemplares: | CNPMS - (8860-1) - UPC - AP - DD -  -  -  - DIS