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

Soil pH, electric conductivity and organic matter after three years of consecutive amendment of composted tannery sludge

Ademir Sérgio Ferreira Araújo1*, Maria Dorotéia Marçal Silva1, Luiz Fernando Carvalho Leite2, Fabio Fernando de Araujo3 and Nildo da Silva Dias4
1Federal University of Piauí, Agricultural Science Center, Soil Quality Laboratory, Campus da Socopo, CEP 64000-000, Teresina, PI, Brazil. 2Embrapa Mid-North, Av. Duque de Caxias, Teresina, PI, Brazil. 3UNOESTE, Campus II, Presidente Prudente, SP, Brazil. 4Federal University of Semi-Arid, UFERSA, Mossoró, RN, Brazil.
Email: [email protected]

  •  Accepted: 08 April 2013
  •  Published: 18 April 2013


Experiments were carried out under field conditions to evaluate the effects of composted tannery sludge (CTS) on soil pH, electric conductivity (EC) and soil organic matter (SOM) content after three years of amendment. The CTS was applied at 0, 2.5, 5.0, 10.0 and 20.0 ton ha-1. In each year, soil samples were collected 60 day after CTS amendment. After three years, the CTS increased about 5, 46 and 69% of the soil pH, EC and SOM content as compared with the control. Consecutive amendment of crescent rates of CTS promotes linear increases in soil pH, electric conductivity and organic matter content.


Key words: Composting, industrial wastes, salinity soil.