Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2755

Full Length Research Paper

Effect of paper mill lime sludge as an acid soil amendment

A. Mohammadi Torkashvand1*, N. Haghighat2 and V. Shadparvar2
1Young Researchers Club Rasht Branch, Islamic Azad University-Rasht Branch, Rasht, Iran. 2Islamic Azad University-Rasht Branch, Rasht, Iran.
Email: [email protected]

  •  Accepted: 29 April 2010
  •  Published: 04 June 2010


The possibility of using paper mill lime sludge as a soil amendment in an acid soil was investigated. Sludge used contained 58.4% calcium carbonates plus a small amount of heavy metals. A pot experiment was conducted with an acid soil andSorghum vulgaris variety speed seed as test plant. Treatments with three replicates consisted of 0, 0.5 and 1, 2 and 4% paper mill lime sludge (L0, L0.5, L1, Land L4, respectively). Shoot were harvested after 60 days and dry matter yield was determined after drying of the harvested shoots at 70°C for 48h. Subsamples of dry shoots were ground and then dry-ashed in a furnace at 550°C and then extracted with 2N HCl. The concentrations of P, K, Fe, Mn and Zn were measured in the extracts. Results showed that paper mill sludge significantly increased pH, which was proportional to the application rate of paper mill sludge. The application of 2% sludge (based on soil dry mass) remarkably increased shoot dry matter and P, K, Fe, Mn, K and P uptake.


Key words: Acid soil, paper mill lime sludge, soil amendment.