African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6380

Full Length Research Paper

Legumes as green manure for common bean cultivated in two growing seasons at southeast Brazil

Filipe Fernandes de Sousa
  • Filipe Fernandes de Sousa
  • Department de Fitotecnia/Agroecology sector, Federal University of Viçosa, Avenue P.H. Rolfs, s/n, Zip Code: 36.570-000, Viçosa, MG, Brazil.
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Davi Lopes do Carmo*
  • Davi Lopes do Carmo*
  • Department de Fitotecnia/Agroecology sector, Federal University of Viçosa, Avenue P.H. Rolfs, s/n, Zip Code: 36.570-000, Viçosa, MG, Brazil.
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Jose Eustaquio de Souza Carneiro
  • Jose Eustaquio de Souza Carneiro
  • Department de Fitotecnia/Agroecology sector, Federal University of Viçosa, Avenue P.H. Rolfs, s/n, Zip Code: 36.570-000, Viçosa, MG, Brazil.
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Segundo Urquiaga
  • Segundo Urquiaga
  • Embrapa Agrobiology, BR 465 – km 7, Zip Code: 23851-970, Seropédica, RJ, Brazil.
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Ricardo Henrique Silva Santos
  • Ricardo Henrique Silva Santos
  • Embrapa Agrobiology, BR 465 – km 7, Zip Code: 23851-970, Seropédica, RJ, Brazil.
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  •  Received: 08 September 2016
  •  Accepted: 05 October 2016
  •  Published: 08 December 2016

Abstract

The use of legumes in pre-cultivation on the common bean has the possibility of providing atmospheric N to the soil, making it available to this crop, and may cover part of its N demand and increase grain yield. The objective of present study was to evaluate the effect of hyacinth bean and jack bean as green manures on the production of common bean grown in two seasons. Cover crops were evaluated for fixed N2, dry matter yield, nitrogen (N) and carbon (C) concentrations, C:N ratio and N accumulation in the shoot. The jack bean accumulated higher biomass and more total N than hyacinth bean and spontaneous vegetation (control). However, both legume species, when used as green manure, resulted in an increase in the N concentration of common bean. Compared to the spontaneous vegetation, hyacinth bean residue increased yield of common bean by 32% and jack bean residue increased the bean yield by 46%. These yields were recorded when common bean was cultivated a few weeks after residues incorporation into the soil and about seven months later, thus showing a flexibility to family farmers for making their decisions on the best cropping season.

Key words: Phaseolus vulgaris, Dolichos lablab, Canavalia ensiformis, family farming, symbiotic nitrogen fixation.