African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6578

Full Length Research Paper

Pore size distribution and hydro-physical properties of cohesive horizons treated with anionic polymer

Diego Vandeval Maranhao de Melo
  • Diego Vandeval Maranhao de Melo
  • Agronomy Department, Federal Rural University of Pernambuco. St. Dom Manoel de Medeiros, s/n, Dois Irmãos. CEP 52171-900 Recife (PE), Brazil.
  • Google Scholar
Brivaldo Gomes de Almeida
  • Brivaldo Gomes de Almeida
  • Agronomy Department, Federal Rural University of Pernambuco. St. Dom Manoel de Medeiros, s/n, Dois Irmãos. CEP 52171-900 Recife (PE), Brazil.
  • Google Scholar
Kairon Rocha Andrade
  • Kairon Rocha Andrade
  • Agronomy Department, Federal Rural University of Pernambuco. St. Dom Manoel de Medeiros, s/n, Dois Irmãos. CEP 52171-900 Recife (PE), Brazil.
  • Google Scholar
Edivan Rodrigues de Souza
  • Edivan Rodrigues de Souza
  • Agronomy Department, Federal Rural University of Pernambuco. St. Dom Manoel de Medeiros, s/n, Dois Irmãos. CEP 52171-900 Recife (PE), Brazil.
  • Google Scholar
Wagner Luis da Silva Souza
  • Wagner Luis da Silva Souza
  • Agronomy Department, Federal Rural University of Pernambuco. St. Dom Manoel de Medeiros, s/n, Dois Irmãos. CEP 52171-900 Recife (PE), Brazil.
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Ceres Duarte Guedes Cabral de Almeida
  • Ceres Duarte Guedes Cabral de Almeida
  • Dom Agostinho Ikas Agricultural School, Federal Rural University of Pernambuco. São Lourenço da Mata (PE), Brazil.
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  •  Received: 08 April 2016
  •  Accepted: 26 July 2016
  •  Published: 03 November 2016

Abstract

Long molecular chain of polymers with active groups, combined with its complexity and flexibility to different environmental conditions provides an interaction of these groups with the mineral soil clays, thereby qualifying the polymers as soil flocculants effective. This study is aimed at evaluating the pore size distribution and hydro-physical properties of soils with cohesive horizons of the coastal plains of Pernambuco State, Brazil, with the application of anionic polyacrylamide (PAM). Thus, three horizons, one cohesive (Bt1) and two non cohesive (E and Bw/Bt) Ultisol were evaluated and, to compare the cohesive horizons, a BA horizon of Oxisol was selected. PAM aqueous solutions (12.5, 50.0 and 100.0 mg kg-1) and distilled water (control = 0 mg kg-1) were applied in undeformed samples by capillary. Pore volume was evaluated by diameter (macro, meso and micropores), total porosity, saturated hydraulic conductivity (Ksat), soil penetration resistance (PR) and soil-water characteristic retention curve. Polymer solutions reduced Ksat, macroporosity and total porosity of cohesive horizons (micropores dominated). More concentrated solutions increased PR of the Bt1 horizon. The excess negative charges in the system are the main factor for the negative effects of PAM on clay horizons. We hope that less electronegative PAMs may improve the hydro-physical characteristics of cohesive horizons.
 
Key words: Polyacrylamide, coastal tablelands, soil penetration resistance, negative charges, water retention, macroporosity.