Data/hora: 12/06/2024 08:46:13

Biblioteca(s): | Embrapa Agrobiologia.
Data corrente: | 13/01/1999
Data da última atualização: | 13/01/1999
Autoria: | IBIJBIJEN, J.; URQUIAGA, S.; ISMAILI, M.; ALVES, B. J. R.; BODDEY, R. M.
Título: | Effect of arbuscular mycorrhizas on uptake of nitrogen by Brachiaria arrecta and Sorghum vulgare from soils labelled for several years with 15N.
Ano de publicação: | 1996
Fonte/Imprenta: | New Phytologist, Cambridge, v. 133, p. 487-494, 1996.
Idioma: | Inglês
Conteúdo: | A pot experiment was conducted under glasshouse conditions to investigate the effect of the inoculation of arbuscular mycorrhizal (AM) fungi on the growth and N uptake of two graminaceous plants: Brachiaria arrecta (Hack. ex. Th. Dur & Schinz) Stent and Sorghum vulgare (Pers.) growing in four fumigated soils which had been labelled for several years with 15N. The four soils had different chemical characteristics, especially in their P availability. The levels of root colonization by AM fungi were inversely related to the P concentration in these soils. Positive responses to AM fungal inoculation were observed for all the yield parameters except in the soil with the highest P availability (40 ug P g-1 soil, extractant Mehlich-1). In the other three soils, AM fungal inoculation of both crops increased N accumulation by between 17 and 46%, but the 15N enrichment of the N absorbed was significantly lower in the mycorrhizal plants than in those not colonized by mycorrhizal fungi. This suggests that some of the N absorbed from the soil by the mycorrhizal roots was derived from N sources other than the mineral N.
Palavras-Chave: | Brachiaria arrecta; VAM.
Thesagro: | Absorção; Micorriza; Nutriente; Sorghum Vulgare.
Thesaurus Nal: | nutrient uptake; vesicular arbuscular mycorrhizae.
Categoria do assunto: | --
Registro original: | Embrapa Agrobiologia (CNPAB)
Exemplares: | CNPAB - (24362-1) - UPC - AP - -- -  -  - 22203 - DIS