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

Determination of appropriate level(s) of aluminium activity for the screening of tropically adapted soybean genotypes in sand culture

G. O. S. Ojo1* and S. A. Ayuba2      
1Department of Crop Production, University of Agriculture, Makurdi, Nigeria. 2Department of Soil Science, University of Agriculture, Makurdi, Nigeria.  
Email: [email protected]

  •  Accepted: 15 June 2012
  •  Published: 28 August 2012

Abstract

A sand culture experiment was conducted at the University of Agriculture, Makurdi, Nigeria, in 2001 and 2002, with the objective of determining the appropriate levels of aluminium activity to screen tropically adapted genotypes of soybean for aluminium stress tolerance. Fifteen genotypes of soybean constituted the main plot, while eight levels of aluminium activity (0, 50, 100, 200, 300, 400, 450 and 500 μMAl3+) constituted the subplots in a split-plot design. The experiment was replicated three times. Plants watered with the 500 μMAl3+ treatment got burnt after 3 to 5 days and were removed from the treatment. Data were taken on the root dry weight, shoot dry weight and relative root surface area at 25DAP. Aluminium, genotype and genotype × aluminium interaction effects were all highly significant. Aluminium activity at 300 μMAl3+ level along with the control (0 μMAl3+) were considered as appropriate for root dry weight, while the 450 μMAl3+ level along with the control (0 μMAl3+) were considered as appropriate for shoot dry weight and relative root surface area and recommended for the rapid screening of tropically adapted genotypes of soybean in sand culture in the tropics. The relative root surface area was the most sensitive in discriminating between levels of aluminium activity and should have preference in any selection programme.

 

Key words: Aluminium activity, sand culture screening, tropically adapted genotypes of soybean.