Efficacy of Candidate Herbicides for Post- Emergence Weed Control in Kenaf (Hibiscus cannabinus L.)

Main Article Content

O. A. Aluko


Post emergence application of herbicides reduced weed growth, enhanced kenaf agronomic traits and fibre yield. A study was conducted to determine the efficacy of some herbicide formulations for post emergence weed control in kenaf at Ibadan (0.7.38N; 003.84E- Derived savanna agro-ecology) station of the Institute of Agricultural Research and Training (IAR&T), Obafemi Awolowo University, Ibadan in 2016 and 2017 rainy seasons.  Herbicides applied were Quazilofop-P-ethyl (100, 150, 200 ml/ha), Oxyfluorfen (0.96, 1.20 and 1.44 kg ai/ha) and Fluazifop-p-butyl 150, 225 and 300 g ai/ha) at three rates each, while weed-free and weedy were the control treatments. Weed flora composition before land preparation was dominated by annual weeds; broadleaves (70%), grass (20%) and spiderwort (10%). At 10 weeks after sowing (WAS), weed flora composition comprised of 64% broadleaf, 14% grass, 8% spiderwort and 14% sedge. Weed flora dynamics after treatments application might have been influenced by herbicide formulations applied. Oldenlandia corymbusa, Cyperus escunlentus, Desmodium scorpurus and Cyperus rotundus were identified as prevalent weeds across the treatments applied while Mimosa pudica, was a minor weed.  Herbicides improved kenaf agronomic traits (plant height, stem-butt girth and number of leaves/plant) due to minimal weed competition; reduced weed flora composition and weed weight relative to weed infested kenaf plants in weedy control. Oxyfluorfen (0.96, 1.20 and 1.44 kg ai/ha); fluazilof-p-butyl (225 and 300 g ai/ha); Quazilofop-P-ethyl (100 and 200 ml/ha) reduced weed dry weight by 60-70%. Weed-free plots had the highest weed control efficiency (WCE %). Evidently, acceptable WCE of ≥ 80% and comparable gross fibre yield with the maximum in weed-free recorded in Oxyfluorfen (1.20 and 1.44 kg ai/ha) and Fluazilofop-p-butyl (300 g ai/ha) showed their efficacies. However, low WCE 50 -65% in Quazilofop-p-ethyl (100, 150, 200 ml/ha) might reflected a review of the doses applied for better efficacy.  Kenaf gross fibre yield was reduced by 65% in the weedy check plot, due to superior weed infestation and utmost weed dry weight accumulation. Notwithstanding, the benefit-cost ratio and environmental impact assessment of the study must be carried out for economically viable kenaf production and environmental friendliness.

Kenaf, herbicides, post-emergence, weed control efficiency, weed dry weight.

Article Details

How to Cite
Aluko, O. (2019). Efficacy of Candidate Herbicides for Post- Emergence Weed Control in Kenaf (Hibiscus cannabinus L.). Journal of Agriculture and Ecology Research International, 19(3), 1-7. https://doi.org/10.9734/jaeri/2019/v19i330085
Original Research Article


Webber CL, Bledsoe RE. Kenaf: Production, harvesting, processing, and products. In Janick, J. and Simon, J. E. (Eds). New Crops. Wiley, New York. 1993; 416-421.

Mohamed A, Bhardwaj H, Hamama A, Webber III CL. Chemical composition of kenaf (Hibiscus cannabinus L.) seed oil. Industrial Crop Production Journal. 1995; 4:152–165.

Aluko OA, Ajijola S, Ayodele OP. Effect of weed control methods on profitable kenaf (Hibiscus cannabinus L) production in rainforest-savanna Transition agro-ecology of Nigeria. Global Journal of Agricultural Research. 2017;5(2):1-10.

Ajibola AT, Modupeola TO. Determination of the optimum weeding Regime on seed yield of two selected kenaf varieties in South-West Nigeria. Research Journal of Seed Science. 2014;7:125–131.

Aluko OA, Olasoji JO. Influence of Nitrogen fertilizer on kenaf performance and weed suppression. Journal of Agriculture and Veterinary Sciences. 2017; 10(8):54–60.

Chikoye D, Schulz S, Ekeleme F. Evaluation of integrated weed management practices for maize in the northern guinea savanna of Nigeria. Crop Protection. 2004;23:895–900.

Bhat DJ, Pandey RK, Chopra S, Gupta RK, Dogra S. Influence of herbicides on weed population and morpho-metrical attributes under different season in African marigold (Tagetes erecta L.). Progress. Hortic. 2012;44:89–95.

Das TK, (Eds). Weed science: Basic and Applications. Jain Brothers, New Delhi. 2011;910.

Eko Wadaryanto, Fadhilah Roviyanti. Efficacy of Oxyfluofen herbicide for weed control in Broccoii (Brassica oleracea L. var. Italic). Asian Journal of Crop Science. 2017;9(2):28–34.

Akobundu IO, Agyakwa CW. A handbook of West African Weeds. 1998;581.

Mani VS, Malla MI, Gautam KC, Bhagwandas. Weed killing chemicals in Potato cultivation. Indian Farming. 1973; VXXII:17–18.

Aluko OA, Chikoye D, Smith MAK. Effects of tillage, plant spacing and soybean genotypes on speargrass [Imperata cylindrica (L.) Reauschel] suppression. African Journal of Agricultural Research. 2012;7(7):1068–1072.

Aluko OA. Speargrass [Imperata cylindrica (L.) Raeuschel] dynamics and influence of tillage, spacing and kenaf (Hibiscus cannabinus L.) genotypes on its management in Oyo state, (Ph.D Thesis in Pest management) FUTA, Nigeria; 2018.