Data/hora: 12/06/2024 20:09:22

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 07/05/2002
Data da última atualização: | 07/05/2002
Autoria: | BURITY, H. A.; FARIS, M. A.; COULMAN, B. E.
Título: | Nitrogenase Activity and Vegetative Regrowth of Alfalfa Grown Alone and in Mixture With Grass After Sucessive Harvests.
Ano de publicação: | 1989
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, v. 24, n.6, p. 683-692, jun. 1989
Idioma: | Inglês
Conteúdo: | A fieId experiment was conducted with the purpose of establish the behavior of the nitrogenase activity and nodule mass of alfalfa plants and the effect that some grass species may have on the rate of legume N2-fixation during many successive harvest cycles, when both grown in mixed stands. The results has shown üiat nitrogenase activity of alfalfa (Medicago sativa L.) is not significantly affécted when grown in association with timothy (PNeum pratense L.) or brornegrass (Bromus inermis Leyss.). It was concluded that rnixed cultures; of alfalfa with timothy or brornegrass; have no effect on alfalfa N2-fixation (acetylene reduction). The initial decline in nitrogenase activity within two days of harvest, and subsequent fast recovery of nodule, activity after harvest associated with the maintenance of the nodule weight of alfalfa suggest that the alfalfa plants have an adaptive mechanism to the stress; of shoot rernoval. This may explain why the capacity of N2-fixation by alfalfa is only temporarily impaired with fagt recovery rate in comparison to other forage legumes.
Palavras-Chave: | acetylen reduction; association; bromegrass; Bromus inernis; Phlewn pratense; specific nodule activity; timothy grass.
Thesagro: | Medicago Sativa; Rhizobium Meliloti.
Thesaurus Nal: | nitrogen fixation.
Categoria do assunto: | --
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (22208-1) - UMT - AP - -- - 63072081 - P474 -  - DIS