Data/hora: 10/05/2024 05:32:43

Biblioteca(s): 	Embrapa Unidades Centrais.	
Data corrente: 	09/03/2015	
Data da última atualização: 	25/05/2017	
Autoria: 	MARTINS, J. C. R.; FREITAS, A. D. S. de; MENEZES, R. S. C.; SAMPAIO, E. V. de S. B.	
Afiliação: 	JÚLIO CÉSAR RODRIGUES MARTINS; ANA DOLORES SANTIAGO DE FREITAS; RÔMULO SIMÕES CEZAR MENEZES; EVERARDO VALADARES DE SÁ BARRETO.	
Título: 	Nitrogen symbiotically fixed by cowpea and gliricidia in traditional and agroforestry systems under semiarid conditions.	
Ano de publicação: 	2015	
Fonte/Imprenta: 	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 50, n. 2, p. 178-184. fev. 2015	
Idioma: 	Inglês	
Notas: 	Título em português: Nitrogênio fixado simbioticamente por feijão?caupi e gliricídia em sistemas tradicional e agroflorestal sob condições semiáridas.	
Conteúdo: 	The objective of this work was to estimate them amounts of N fixed by cowpea in a traditional system and by cowpea and gliricidia in an agroforestry system in he Brazilian Northeast semiarid. The experiment was carried out in a randomized complete block design, in a split?plotb arrangement, with four replicates, in he semiarid egion of the state of Paraíba, Brazil. Plots consisted of agroforestry and traditional systems (no trees), and split?plots of the three crops planted between the tree rows in the agroforestry system. To estimate N fixation, plant samples were collected in the fourth growth cycle of the perennial species and in the fourth planting cycle of the annual species. In he agroforestry system with buffel grass and prickly?pear cactus, gliricidia plants symbiotically fix high proportions of N (>50%) and contribute with higher N amounts (40 kg ha?1 in leaves) than in the traditional system (11 kg ha ?1 in grain and 18 kg ha ?1 in straw). In the agroforestry system with maize and cowpea, gliricidia plants do not fix nitrogen, and N input is limited to the fixation by cowpea (2.7 kg ha ?1 ), which is lower than in the traditional system due to its lower biomass production.	
Palavras-Chave: 	15N; Abundância natural; Biological nitrogen fixation; Fixação biológica do nitrogênio; Natural abundance.	
Thesagro: 	Vigna Unguiculata.	
Thesaurus Nal: 	Gliricidia sepium.	
Categoria do assunto: 	--	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/119837/1/Nitrogen-symbiotically-fixed.pdf	
Registro original: 	Embrapa Unidades Centrais (AI-SEDE)	
Exemplares: 	AI-SEDE - (57378-1) - UPE - AP - PP - 603.72081 - P474 -  - DIS