African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6688

Full Length Research Paper

Effect of N fertilization on NPK content in castor bean under saline stress

Geovani Soares de Lima
  • Geovani Soares de Lima
  • Academic Unit of Agricultural Engineering, Federal University of Campina Grande, Campina Grande, CEP 58.109-970, Paraiba, Brazil
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Reginaldo Gomes Nobre
  • Reginaldo Gomes Nobre
  • Academic Unit of Agricultural Science, Federal University of Campina Grande, Pombal, CEP 58.840-000, Paraiba, Brazil.
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Hans Raj Gheyi
  • Hans Raj Gheyi
  • Nucleus for Soil and Water Engineering, Federal University of Reconcavo 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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  •  Received: 27 January 2015
  •  Accepted: 16 July 2015
  •  Published: 13 August 2015

Abstract

The high concentrations of salts in water, especially in semiarid regions, increase salt concentration in the soil and plant with the consequent decrease in NPK contents. Current study evaluates the influence of irrigation with water of different salinities, associated to nitrogen (N) fertilization, on NPK contents in castor bean cv. BRS Energia. An experiment was conducted for four months, in lysimeters under the  field condition, in the municipality of Pombal, Paraíba - Brazil, using an  Eutrophic Entisol of sandy loam texture ina randomized 5 × 4 factorial block design with three replications. Five levels of electrical conductivity of irrigation water (ECw=0.3, 1.2, 2.1, 3.0 and 3.9 dS m-1) and four doses of N (70, 100, 130 and 160 mg kg-1) were tested. The highest contents of potassium (K) in roots and leaves were obtained respectively with ECw of 0.3 and 2.2 dS m-1. The N content in leaves was not influenced by factors under analysis. Increase in N dose decreased the plant contents of phosphorus (P) and K.

 

Key words: Ricinus communis L., electrical conductivity, regressions.