Data/hora: 03/06/2024 01:20:00

Provedor de dados: 	86	
País: 	Brazil	
Título: 	Nitrogen fixation by groundnut and velvet bean and residual benefit to a subsequent maize crop	
Autores: 	Okito,Ambate; Alves,Bruno José Rodrigues; Urquiaga,Segundo; Boddey,Robert Michael.	
Data: 	2004-12-01	
Ano: 	2004	
Palavras-chave: 	Arachis hypogaea; Mucuna pruriens; Zea mays; 15N natural abundance technique; Green manures; N balance; Small-holder producers.	
Resumo: 	Chemical fertilisers are rarely avaiable to poor farmers, for whom the nitrogen (N) is often the most limiting element for cereal grain production. The objective of this study was to quantify the contribution of biological nitrogen fixation (BNF) to groundnut (Arachis hypogaea) and velvet bean (Mucuna pruriens) crops using the 15N natural abundance (delta15N) technique and to determine their residual effect and that of a natural fallow, on growth and N accumulation by two rustic maize varieties. The contribution of BNF calculated from delta15N data was 40.9, 59.6 and 30.9 kg ha-1, for groundnut, velvet bean and the natural fallow, respectively. The only legume grain harvested was from the groundnut, which yielded approximately 1.000 kg ha-1. The subsequent maize varieties ("Sol de Manhã" and "Caiana Sobralha") yielded between 1.958 and 2.971 kg ha-1, and were higher after velvet bean for both maize varieties and "Sol da Manhã" groundnut, followed by "Caiana" after groundnut and, finally, the natural fallow. For a small-holder producer the most attractive system is the groundnut followed by maize, as, in this treatment, both groundnut and maize grain harvest are possible. However, a simple N balance calculation indicated that the groundnut-maize sequence would, in the long term, deplete soil N reserves, while the velvet bean-maize sequence would lead to a build up of soil nitrogen.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2004001200004	
Editor: 	Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira	
Relação: 	10.1590/S0100-204X2004001200004	
Formato: 	text/html	
Fonte: 	Pesquisa Agropecuária Brasileira  v.39 n.12 2004	
Fonte: 	info:eu-repo/semantics/openAccess