Data/hora: 27/07/2024 03:02:26

Biblioteca(s): 	Embrapa Agrobiologia; Embrapa Roraima; Embrapa Soja.	
Data corrente: 	22/03/2021	
Data da última atualização: 	03/01/2022	
Autoria: 	ZILLI, J. E.; PACHECO, R. S.; GIANLUPPI, V.; SMIDERLE, O. J.; URQUIAGA, S.; HUNGRIA, M.	
Afiliação: 	JERRI EDSON ZILLI, CNPAB; UFRRJ; VICENTE GIANLUPPI, CPAF-RR; OSCAR JOSE SMIDERLE, CPAF-RR; SEGUNDO SACRAMENTO U CABALLERO, CNPAB; MARIANGELA HUNGRIA DA CUNHA, CNPSO.	
Título: 	Biological N2 fixation and yield performance of soybean inoculated with Bradyrhizobium.	
Ano de publicação: 	2021	
Fonte/Imprenta: 	Nutrient Cycling in Agroecosystems, v. 119, p. 323-336, 2021.	
ISSN: 	1385-1314	
Idioma: 	Inglês	
Notas: 	Supplementary Material: Bradyrhizobium inoculation, N2 fixation and yield performance of soybean in the 
Amazonian savanna of northern Brazil.	
Conteúdo: 	The performance of the soybean (Glycine max) inoculated with Bradyrhizobium is influenced by cropping history. However, re-inoculation with elite strains of Bradyrhizobium generally provides increases in soybean grain yield. The Amazonian savanna has an agricultural frontier area where soybeans have recently been introduced. In this study, we evaluated soybean nodulation, N accumulation, N2 fixation, and grain yield responses to inoculation with the commercial Bradyrhizobium strains SEMIA 587 and SEMIA 5019 of B. elkanii, SEMIA 5079 of B. japonicum, and SEMIA 5080 of B. diazoefficiens. Four field experiments were performed in areas with or without previous cropping with inoculated soybean that contained preexisting bradyrhizobia populations of???103 or?<?102 cells g?1 soil, respectively. Inoculation of soybean in first-year cropping areas resulted in increases in several parameters compared to those in non-inoculated soybean; as expected, these effects were less pronounced when areas had been previously cropped with soybean. Despite no statistical differences, re-inoculation provided average increases in grain yield of 12 to 18% compared to that in the non-inoculated control. A dose of 200 kg ha?1 of N-fertilizer impaired the nodulation and did not increase grain yields when compared with the inoculation. Estimates obtained with the 15 N natural abundance technique confirmed the high contribution of N2 fixation in inoculated plants, ranging from 84 to 90%. Although soybean cropping increases the soil bradyrhizobia population size, annual inoculation is important to guarantee host infection by efficient strains of soybean Bradyrhizobium and their persistence in savanna soils.	
Palavras-Chave: 	Biological nitrogen fixation; Glicina; História de cultivo do solo; Rendimento máximo de grãos; Rizóbio do solo população; Soil cropping history; Soil rhizobia population.	
Thesagro: 	Fixação de Nitrogênio; Glycine Max; Grão; Rendimento; Soja.	
Thesaurus Nal: 	Grain yield; Nitrogen fixation; Rhodobium (Rhizobiaceae); Soybeans.	
Categoria do assunto: 	S Ciências Biológicas
X Pesquisa, Tecnologia e Engenharia	
Registro original: 	Embrapa Agrobiologia (CNPAB)	
Exemplares: 	CNPAB - (41680-1) - UPC - AP - DD -  -  -  - DIS
CPAF-RR - (16136-1) - UPC - AP - DD -  -  -  - DIS
CNPSO - (40321-1) - UPC - AP - DD -  -  -  - DIS