Data/hora: 05/06/2024 08:57:58

Biblioteca(s): | Embrapa Agrobiologia.
Data corrente: | 16/09/1996
Data da última atualização: | 16/09/1996
Autoria: | BODDEY, R. M.; OLIVEIRA, O. C. de; URQUIAGA, S.; REIS, V. M.; OLIVARES, F. L. de; BALDANI, V. L. D.; DOBEREINER, Johanna.
Título: | Biological nitrogen fixation associated with sugar cane and rice: Contributions and prospects for improvement.
Ano de publicação: | 1995
Fonte/Imprenta: | Plant and Soil, Netherlands, v. 174, p. 195-209, 1995.
Idioma: | Inglês
Conteúdo: | 15N isotope and N balance studies performed over the last few years have shown that several Brazilian varieties of sugarcane are capable of obtaining over 60% of their nitrogen (>150 kg N ha-1 year-1) from biological nitrogen fixation (BNF). This may be due to the fact that this crop in Brazil has been systematically bred for high yields with low fertilizer N inputs. In the case of wetland rice, N balance experiments performed both in the field and in pots suggest that 30 to 60 N ha-1 crop-1 may be obtained from plant-associated BNF and that different varieties have different capacities to obtain N from this source. 15N2 incorporation studies have proved that wetland rice can obtain at least some N from BNF and acetylene reduction (AR) assays also indicate    differences in N2-fixing ability between different rice varieties. However in situ AR field estimates suggest plant-associated BNF inputs to be less than 8 kg N ha-1 crop-1. The problems associated with the use of the 15N dilution technique for BNF quantification are discussed and illustrated with data from a recent study performed at EMBRAPA-CNPAB. Although many species of diazotrophs have been isolated from the rhizosphere of both sugarcane and wetland rice, the recent discovery of endophytic N2-fixing bacteria within roots, shoots and leaves of both crops suggests, at least in the case of sugarcane, that these bacteria may be the most important contributors to the observed BNF contributions. In sugarcane both Acetobacter diazotrophicus and ...
Palavras-Chave: | Acetobacter diazotrophicus; BNF; FBN; Fixacao biologica de nitrogenio; Nitrogen fixing bacteria.
Thesagro: | Arroz; Cana de Açúcar.
Thesaurus Nal: | Herbaspirillum; rice; sugarcane.
Categoria do assunto: | --
Registro original: | Embrapa Agrobiologia (CNPAB)
Exemplares: | CNPAB - (4218-1) - UPC - SP - -- -  -  - 002712 - DIS