Browsing by Author "Alabi, K.O."

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    GROWTH AND YIELD RESPONSES OF SESAME AND SORGHUM IN SESAME/SORGHUM INTERCROPPING
    (Nigerian Journal of Crop Science, 2022-05) Afe, A.I.; Alabi, K.O.; Wahab, A.A; Oladipo, S.F.
    A field trial was carried out at the Kwara State University Teaching and Research farm in the 2019 cropping season. The study aimed to investigate the growth and yield responses of sesame as sorghum as affected by varying Population density of both crops. Seven population densities viz: 100%SE:100%SH, 100%SE:75%SH, 100%SE:50%SH, 100%SE:25%SH, 75%SE:100%SH, 50%SE:100%SH, and 25%SE:100%SH plant population per hectare where SE and SH represented sesame and sorghum respectively were combined in a Randomised Complete Block Design (RCBD) and replicate three times. The full population of each crop 111,111 and 55,555 plants per hectare respectively for sesame and sorghum were also included in the treatment as a control. The height and grain Yield of sorghum were significantly influenced by population density of component sesame. The height decreased as the population density of component sesame decreased. The seed yield of sesame was affected by population density of component sorghum with the lowest yield (115,19 kg/ha) obtained at 100 SH:25SE population ratio. Reasonable intercropping advantage was observed at the treatments where 55,555 and 41,250 population density of sorghum was intercropped with 111,111 plant population of sesame as measured by the land equivalent ratios (LER) and Land equivalent Coefficient (LEC) indices. Intercropping sorghum at population density of 27,777 and 13,750 with sesame at population density of 111,111 plants per hectare was disadvantageous. Aggressivity (A) values were positive for sorghum and negative for sesame in all population ratios tested except, 50SH:100SE and 25SH:100SE population ratios. The competitive ratio (CR) values followed a similar trend to the A values. The highest A value, 0.70 and -0.86, and CR, 18.2 and 4.20 respectively for sorghum and sesame were recorded at 100SH:25SE population ratios. A reasonable intercropping advantage was obtained at the treatment where the full population ratio of both was intercropped and hence, recommended for adoption.
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    Influence of Tillage Systems on Diversity and Abundance of Insect and Nematode Pests of Maize in Malete, Kwara State, Nigeria
    (Asian Journal of Advances in Agricultural Research, 2018-10-31) Aderolu1, I.A.; Lawal, O.O.; Wahab, A.A.; Alabi, K.O.; Osunlola, O.S.; Giwa, M.M.
    Pests are major biotic factors causing up to 45% yield reduction in maize production. There is limited information on pests affecting maize in Malete, Kwara State, Nigeria. The types of insects and nematodes associated with ten quality protein maize varieties (QPMVs) were evaluated for pests’ occurrence, abundance and diversity on ‘plough only plots (POP)’ and ‘plough and harrow plots (PAHP)’ as primary and secondary tillage, respectively. The experiment was carried out using QPMVs at the Teaching and Research Farm of the Kwara State University, Malete and arranged in a randomised complete block design with 11 treatments replicated 3 times, including local check “pambo”. Data were collected on insect and nematode populations and yield parameters and analysed using ANOVA with descriptive statistics and standard diversity indices at P≤0.05. A total of 833.1±4.0 and 799.3±3.4 arthropod individuals from POP and PAHP tillage practices, respectively comprising 8 orders and 18 families. Ootheca mutabilis was the most abundant species, with 5.47% (POP) and 5.68% (PAHP) and the least was Rhopalosiphum maidis 1.82% (POP) and 1.80% (PAHP). As indicated by Shannon-Wiener (3.46±0.023) and Simpson indices (0.97±0.0008), there was even distribution in the tillage practices. Three genera of plant parasitic nematodes (PPNs) namely: Meloidogyne spp. [(POP (78.33±19.65), PAHP (1.33±0.33)], Pratylenchus spp. [(POP (41.67±9.26), PAHP (5.00±2.31)], and Helicotylenchus spp. [(POP (58.33±38.35), PAHP (23.33±14.50)] were identified. The yield parameters and a number of the whole plant infested were significantly higher in the PAHP than the POP. The use of secondary tillage practice is effective in reducing insects and nematodes associated with ten quality protein maize varieties and, therefore, recommended for the management of these pests in maize production.