African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6574

Full Length Research Paper

Gas exchange, growth and yield of cowpea genotypes under different irrigation strategies

Rômulo Carantino Lucena Moreira
  • Rômulo Carantino Lucena Moreira
  • Academic United of Agricultural Science, Federal University of Campina Grande, UFCG, Pombal, PB, Brazil.
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Marcos Eric Barbosa Brito
  • Marcos Eric Barbosa Brito
  • Academic United of Agricultural Science, Federal University of Campina Grande, UFCG, Pombal, PB, Brazil.
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Roberto Cleiton Fernandes de Queiroga
  • Roberto Cleiton Fernandes de Queiroga
  • Academic United of Agricultural Science, Federal University of Campina Grande, UFCG, Pombal, PB, Brazil.
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Luciano Jonatas Gomes Frade
  • Luciano Jonatas Gomes Frade
  • Academic United of Agricultural Science, Federal University of Campina Grande, UFCG, Pombal, PB, Brazil.
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Franciscleudo Bezerra da Costa
  • Franciscleudo Bezerra da Costa
  • Academic United of Agricultural Science, Federal University of Campina Grande, UFCG, Pombal, PB, Brazil.
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Francisco Hevilásio Freire Pereira
  • Francisco Hevilásio Freire Pereira
  • Academic United of Agricultural Science, Federal University of Campina Grande, UFCG, Pombal, PB, Brazil.
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Luderlândio de Andrade Silva
  • Luderlândio de Andrade Silva
  • Academic United of Agricultural Science, Federal University of Campina Grande, UFCG, Pombal, PB, Brazil.
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Carlos Jardel Andrade Oliveira
  • Carlos Jardel Andrade Oliveira
  • Academic United of Agricultural Science, Federal University of Campina Grande, UFCG, Pombal, PB, Brazil.
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  •  Received: 12 May 2016
  •  Accepted: 02 June 2016
  •  Published: 30 June 2016

Abstract

Water availability is a major limiting factor for cowpea bean crops, especially in semiarid regions, where it is necessary to adopt more productive and tolerant genotypes and efficient strategies for water use. Thus, an experiment was carried under field conditions in the semiarid region of Pombal city, PB, Brazil. Using a completely randomised blocks design experiment and four replications, in a factorial scheme. The first factor was formed by four cowpea beans genotypes (Costela de Vaca, Pingo-de-Ouro, Paulistinha and BRS Marataoã), and the second factor consisted of five different irrigation strategies (40, 60, 80, 100 and 120% of actual evapotranspiration (ETr)). Gas exchange was evaluated at the V4 stage, dry biomatter formation at the R2 stage and crop yield until 90 days after sowing. The gas exchange from cowpea genotypes was reduced by lower irrigation amounts. For dry biomass formation, greater values in the Pingo-de-Ouro genotype were observed when irrigated with 120% of ETr. Thus, the treatment of 120% ETr improved the growth in dry matter independently of the genotype. The Costela de Vaca genotype had better CO2 assimilation rates. Paulistinha had the highest productivity among genotypes, and Costela de Vaca had the greatest water use efficiency.

Key words: Assimilation rate, Vigna unguiculata, water productivity.