African Journal of
Plant Science

  • Abbreviation: Afr. J. Plant Sci.
  • Language: English
  • ISSN: 1996-0824
  • DOI: 10.5897/AJPS
  • Start Year: 2007
  • Published Articles: 774

Full Length Research Paper

Effect of soybean (Glycine max) leaf extracts on germination and early growth of speargrass (Imperata cylindrica (L.) Reauschel

Aluko Olubunmi A.1*, Chikoye D.2 and Smith Muftau A. K.3          
1Institute of Agricultural Research and Training, Obafemi Awolowo University, P.M.B. 5029, Moor Plantation, Ibadan, Nigeria. 2International Institute of Tropical Agriculture, Mozambique. 3Federal University of Technology, P.M.B. 704, Akure, Nigeria.
Email: [email protected]

  •  Accepted: 17 June 2011
  •  Published: 27 January 2012


Allelopathy in plants can be instrumental in the suppression of weeds in a crop-weed interaction. Soybean has been found to exhibit allelopathetic effects by inhibiting speargrass germination and subsequent growth. The results showed that soybean and velvet bean extracts significantly reduced speargrass germination by 46 and 54% respectively. There was significant reduction in shoot and root length of speargrass by 37 and 63% respectively compared with the control. Bioassay test on maize (TZL COMP. 4 CL) showed positive response to extracts application. However maize treated with velvetbean (Mucuna cochinchinensis) extract had significantly lower root length. Speargrass seeds treated with the extracts of TGX 1910-8F, TGX1448-2E and TGX 1864-17F had significantly lower seed germination and seedling growth. The presence of allelochemical(s) is implicated in the study.


Key words: Allelochemical(s), speargrass, soybean genotypes, extracts.