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The ability of leguminous green manure to incorporate significant amounts of nutrientes into the soil makes them excellent alternatives for the region agriculture systems. This study aimed to evaluate the potential use of six leguminous species ( Crotalaria juncea, Canavalia ensiformes, Cajanus cajan, Crotalaria spectabilis, Dolichos lab lab and  Mucuna deeringiana ) as green manure in an area of the Jaguaribe-Apodi agricultural region, CE, Brazil. The experiments were carried out under field conditions in a randomized block design with five replications. Sampling of biomass of shoots was carried out 78 days after sowing on each plot. It was determined the total biomass and nutrients accumulation in the plants that grew in the plots (leguminous and weeds). We concluded that the use of Crotalaria juncea showed up as the most promising treatment in terms of biomass production and nutrient accumulation. Biomassa e acumulo de nutrients por especies de leguminosas utilizadas como adubo verde na regiao do Jaguaribe-Apodi, Ceara, Brasil Resumo : A habilidade de especies de leguminosas utilizadas como adubos verdes em incorporar quantidades significativas de nutrientes no solo fazem destas excelentes alternativas para as regioes agricolas. O objetivo deste trabalho foi avaliar o potencial de utilizacao de seis especies leguminosas ( Crotalaria juncea ; Canavalia ensiformes - feijao-de-porco; Cajanus cajan - Guandu anao; Crotalaria spectabilis ; Dolichos lab lab - Labe-labe; e Mucuna deeringiana - Mucuna ana) como adubo verde em uma area no Agropolo Jaguaribe-Apodi, CE, Brasil. Os experimentos foram desenvolvidos em condicoes de campo, em blocos casualizados com cinco repeticoes. Foram amostradas as partes aereas das plantas aos 78 dias apos a semeadura em cada parcela. Foram determinadas a biomassa e o acumulo totais de nutrientes das plantas que cresceram na parcela (leguminosas e invasoras). Nas condicoes edafoclimaticas em que o trabalho foi realizado pode-se concluir que o tratamento com utilizacao de Crotalaria juncea apresentou-se como o mais promissor em termos de aporte de fitomassa e acumulo de nutrientes.

Biomass and nutrient accumulation of leguminous green manure species in the Jaguaribe-Apodi region, Ceará, Brazil