African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6576

Full Length Research Paper

Cultivation of colored cotton irrigated with saline water under potassium and nitrate/ammonium fertilization

Geovani Soares de Lima
  • Geovani Soares de Lima
  • Academic Unit of Agricultural Engineering, Federal University of Campina Grande, Campina Grande, CEP 58.109-970, Paraíba, Brazil.
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Luan Dantas de Oliveira
  • Luan Dantas de Oliveira
  • Academic Unit of Agricultural Engineering, Federal University of Campina Grande, Campina Grande, CEP 58.109-970, Paraíba, Brazil.
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Hans Raj Gheyi
  • Hans Raj Gheyi
  • Nucleus for Soil and Water Engineering, Federal University of Recôncavo of Bahia, Cruz das Almas, CEP 44.380-000, Bahia, Brazil.
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Lauriane Almeida dos Anjos Soares
  • Lauriane Almeida dos Anjos Soares
  • Academic Unit of Agricultural Engineering, Federal University of Campina Grande, Campina Grande, CEP 58.109-970, Paraíba, Brazil.
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Claudivan Feitosa de Lacerda
  • Claudivan Feitosa de Lacerda
  • Department of Agricultural Engineering, Federal University of Ceará, Fortaleza, CEP 60.450-760, Ceará, Brazil.
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João Batista dos Santos
  • João Batista dos Santos
  • Academic Unit of Agricultural Engineering, Federal University of Campina Grande, Campina Grande, CEP 58.109-970, Paraíba, Brazil.
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Benício Medeiros de Araújo
  • Benício Medeiros de Araújo
  • Academic Unit of Agricultural Engineering, Federal University of Campina Grande, Campina Grande, CEP 58.109-970, Paraíba, Brazil.
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  •  Received: 18 October 2015
  •  Accepted: 12 November 2015
  •  Published: 07 January 2016

Abstract

This study aimed to evaluate growth and production components of the colored cotton cultivar ‘BRS Topázio’ irrigated with saline water as a function of dose of potassium and proportions of nitrate and ammonium. The study was conducted in drainage lysimeters under greenhouse conditions, in a eutrophic Gray Argisol of sandy clay loam texture, in the municipality of Campina Grande, Brazil, from November 2014 to March 2015. A randomized block design was used to test five doses of potassium-DK (50, 75, 100, 125 and 150% of the recommendation for pot experiments) and five proportions of nitrate and ammonium-PNA (100/0, 75/25, 50/50, 25/75 and 0/100 mg of N kg-1 of soil). The K dose referring to 100% corresponded to 150 mg of K2O kg-1 of soil. N supply in NO3-/NH4+ proportion of 25/75, promoted increase in growth variables (plant height, stem diameter and leaf area) and mass of cotton bolls. The K dose of 145.5 mg of K2O kg-1 of soil promoted the formation of higher number of bolls plant-1. The application of K in the doses of 112.5 and 187.5 mg of K2O combined with 25/75 and 0/100 mg of NO3-/NH4+ promoted increment in cottonseed mass and the dose of 187.5 mg of K2O associated with 25/75 mg of NO3-/NH4+ increased the number of days for flower bud opening.

 

Key words: Gossypium hirsutum L., saline stress, mineral nutrition