Crop Protection & Environmental Biology
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Item Effect of Crude Cassava Water Extract as a natural herbicide on the proximate composition and bioaccumulation of hydrocyanic acid in food components of cowpea (Vigna unguiculata (L.) Walp)(2013) Fayinminnu, O. O.; Adesiyan, S. O.This study was a field trial of two experiments to examine the effect of crude cassava water extract (CCWE) as a natural post-emergence herbicide on nutritional quality and bioaccumulation of hydrocyanic acid in cowpea seeds. The spraying of CCWE on cowpea plants was carried out weekly for 5weeks. Treatments of CCWE at 25 and 50% concentrations of MS6 (Manihot Selection), TMS30555 (Tropical Manihot Selection) and Bulk CCWE (different cassava varieties), hand weeded and unweeded (controls) were laid in randomised complete block design with three replications respectively. At maturity, dry samples of cowpea `Ife brown` seeds were ground to fine powder and the proximate composition and bioaccumulation of hydrocyanic acid in the two experiments were determined. Significant variations (p<0.05) were obtained among the herbicide treatments for all parameters. Bulk CCWE at 25 and 50% recorded highest crude protein content (28.02%) and the least ash content (3.06%) followed by TMS at 25 and 50%; MS CCWE at 50% recorded highest dry matter (92.73%) and the least moisture content (7.27%) which were much better than the control (hand weeded). The values of bioaccumulated hydrocyanic acid obtained were similar (p>0.05) among the herbicide treatments. It was therefore recommended that CCWE could be used as a natural post-emergence herbicide in cowpea production without altering the nutritional quality and residue of hydrocyanic acid in cowpea seeds.