African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6574

Full Length Research Paper

Growth and Cu and Zn uptake of two forage grasses affected by application of vermicompost spiked with different metal contents

Haixiang Cheng1,2, Guangming Tian1, Xiuying Jia2, Weiqin Zhu2* and Ji Yang3
  1Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China. 2College of Life and Environmental Sciences, Hang Zhou Normal University, Hangzhou 310036, China. 3Lishui Academy of Agriculture Sciences, Lishui 323000, China.
Email: [email protected]

  •  Accepted: 27 June 2012
  •  Published: 09 October 2012

Abstract

 

To identify environmental risks of vermicompost-borne pollutants after consecutive application for different times, pot experiments were conducted to evaluate the effects of application of polluted vermicompost produced by Eisenia fetida on growth and Cu and Zn uptake of Mexico corn (Euchlaena mexicana) and Sudan grass (Sorghum hybrid Sudangrass) as well as soil characteristics. The results showed that application of vermicompost significantly increased shoot biomass of the two forage grasses, but decreased Mexico corn root biomass. Tissue Cu and Zn contents and soil bio-available fractions of Cu and Zn were significantly increased as the increase of application times, while soil pH and water soluble organic carbon (DOC) decreased. A significantly positive correlation was obtained between soil exchangeable and reducible fractions of Cu and Zn and forage grass tissue metal contents, whereas DOC performed a significantly negative correlation. So, application of polluted vermicompost could contribute to accumulate of soil Cu and Zn exchangeable and reducible fractions, and pose a potential threat to increase tissue Cu and Zn contents of the cultured plants.

 

Key words: Vermicompost, Cu and Zn, tissue uptake, biomass, fractionations.