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

Chemical characterization to evaluate the agricultural potential use of organic wastes generated by industrial and urban activity

Cácio Luiz Boechat1* and Poliana dos Santos Pereira da Silva2
  1Soil Department, Federal University of Rio Grande do Sul, Avenue Bento Gonçalves, 7712, Postal code 91540-000, Porto Alegre city, RS state, Brazil. 2Soil Department, Federal University of Recôncavo da Bahia, Rui Barbosa street, 710, Postal code 44380-000, Cruz das Almas city, BA state, Brazil.
Email: [email protected]

  •  Accepted: 22 May 2012
  •  Published: 17 July 2012

Abstract

 

The use of organic waste as a source of plant nutrition and/or to minimize problems in agricultural soils is one possible use of these materials. The objective of this study was to evaluate the characteristics and some chemical properties of organic wastes from different processes and sources to know the potential for agricultural use and the risks associated with their use. Data were subjected to an analysis of variance (ANOVA) to examine the chemical differences between organic wastes with three replications. A statistical analysis was conducted using the software SAS. The comparison of means was performed using the Turkey’s test at the significance level of (P < 0.01), with three replications. The wastes were separated into acidic, neutral and basic classes. The Ca, Mg, P and N were characterized as an excellent source of these elements in organic and inorganic form, but the C/N ratio limited the use of some of these wastes according to the release time of nutrients expected. Micronutrients and heavy metals are below maximum allowable concentrations by environmental agencies and government.

 

Key words: Organic sludge, pulp mill sludge, sewage sludge, C/N ratio, trace elements