The allelopathic effect of aqueous extracts from sorghum and rice husk on germination and growth of cowpea was investigated. The results showed that the extracts brought about considerable inhibition in the germination of cowpea seeds and in the growth of its radicle and plumule. The germination percentage in the extract-treated seeds decreased with the increase in the concentration of the extracts thus indicating that the degrees of inhibition were concentration dependent. It was apparent that sorghum extracts had more inhibitory effects on cowpea seeds than those from the rice husks. In sorghum extract- treated seeds, radicle growth was observed clearly at 48hrs of the experiment whereas radicle growth was recorded at 24hrs experimental time in the rice husks extracts. Also in sorghum extracts, plumule growth occurred at 72hrs of the experiment whereas plumule growth was recorded at 48hrs experimental time in the rice husks extracts treated seeds.
Kayode, J. and Ayeni, J. M.
"Allelopathic Effects of some Crop Residues on the Germination and Growth of Cowpea (Vigna unguiculata L. Walp.),"
Ethnobotanical Leaflets: Vol. 2009
, Article 10.
Available at: http://opensiuc.lib.siu.edu/ebl/vol2009/iss2/10