Browsing by Author "Togun, A.O."

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    Assessment of plant population on growth, fibre and seed yield of Kenaf (Hibiscus Cannabinus L.) in Ibadan Western
    (The Faculty of Agriculture, University of Ilorin, Nigeria., 2019) Olanipekun, S.O.; Togun, A.O.; Adejumo, S.A.; Adeniyan, O.N.; Adebayo, A.K
    Kenaf is a multi-purpose crop with numerous industrial uses. Its production is constrained by poor cultural and agronomic practices which reduce yield. Inappropriate spacing among others could result in low yield. Effect of plant spacing on growth and yield of kenaf was investigated in Ibadan, Nigeria. Kenaf seed was sown (2 plants/stand) at three plant spacing: 50×15, 50×20, 50×25 cm was assessed for seed and bast fibre yields using randomized complete block design (RCBD) with three replicates. The analysis was done using statistical analysis system (SAS). Plant spacing differed significantly for bast fibre and seed yields. Highest bast fibre yield (0.9±0.03) and seed yield (0.5±0.01) were obtained at 50×20 cm and 50×25 cm spacing, respectively, while the lowest bast fibre yield (0.7±0.01) and seed yield (0.3±0.01) were obtained at 50×15 cm spacing. Spacing of 50 × 15 cm and 50 × 20 cm are appropriate when planting for fibre while 50 × 25cm is appropriate for seed production.
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    Influence of weeding regimes on composition and diversity of weed species in upland rice (oryza sativa l.) field
    (2017) Dada, O.A.; Oladiran, E.M.; Olubode, O.S.; Togun, A.O.
    Abundance of weed species promotes biodiversity within agroecosystems whereas it constitutes biotic stress in arable farmland. There is insufficient information on effects of weed species composition and diversity’ on performance of upland rice in Nigeria. Therefore, a 2-year field study was conducted to assess the weed species composition, diversity and its effects on growth and yield of upland rice cultivars. A split-plot design was used with two rice cultivars (CGI4 and NERICA2) as the main plot treatment and four weeding regimes as the sub-plot. Weeds were sampled from each plot with a 0.5 m * 0.5 m wooden quadrat. The weed species were identified to species level, counted and recorded. Data collected were used to calculate relative frequency, relative density and relative importance value for each species. Dominance, Simpson, Shannon Wiener and evenness indices were used to describe the community structure. The flora of the study site varied widely in occurrence. Twenty four weed species comprising 16 annual herbs, four sedges, three grasses and one commelinaceae Family were found interfering with upland rice. The field had highly diversed annual, herbacious, dicotyledonous and monoc.tyledonous weed species native to tropical ecosystems. The upland rice field had evenly distributed rich and highly diversed weed community. Cultivar CGI4 performed significantly better than NERICA2 with respect to number of leaves (32.56) formed, tillering (8.67) and panicles (8.25) produced. The CG14 plot left unweeded throughout the study period had significantly highest weed biomass (6.16 t/ha) compared to NERICA2 plots. Absolute weed interefence reduced grain yield in NERICA2 and CGI4 cultivars by 42.7 % and 30.9 %, respectively. The biomass accumulated by weed species were inversely related to grain yield (t/ha) in both seasons.