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Articles by S.O. Omotoso
Total Records ( 8 ) for S.O. Omotoso
  Akinrinde E.A. , Olubakin, S.O , S.O. Omotoso and A.A. Ahmed
  This study evaluated the effect of chicken manure, CM (0.02% Zn, 2.30% N, 0.55% P and 0.47% k), zinc sulphate, ZnSO (23% Zn) and their organo-mineral combination (CM+ZnSO ) on the performance of sweet corn (Zea mays, L. Saccharum). Two soils medium acid sandy clay Alfisol from the Southern Guinea Savanna agro-ecological zone of Nigeria and a weakly acid sand Alfisol from the Rainforest zone were used. The fertilizer materials were applied at 0, 20 and 40 mg Zn/kg soil to give nine treatment combinations replicated three times in a Completely Randomized Design (CRD) for each soil. Plant height, stem girth and leaf area) were measured after 7, 14, 21 and 28 days of growth while shoot weight as well as P and Zn concentration and uptake by the crop were determined after 28 days. With application of 40 mg Zn/kg soil on the medium acid Alfisol, CM+ZnSO produced the highest plant shoot biomass (7.7 g/pot) while CM gave the highest (11.0 g/pot) on 4 the weakly acid Alfisol. The application of CM also led to the highest Zn uptake.
  O.J.Ayodele , S.O. Omotoso and C.O. Akinrinsola
  Field experiments were conducted to study the effect of P application on egusi grown in two Alfisols soils at Ibadan in the subhumid zone of South-Western Nigeria. There were five P treatments (0, 10, 0, 0, 40 kg P.ha 1), applied as single superphosphate (SSP, 18% P205). The treatments were replicated four times and arranged in a randomized complete block design. The result indicated that fruit and seed (egusi) yields increased significantly (p>0.05), 0 kgP.ha 1 produced highest yield in 1999 and did not differ from higher rates up to 40 kgP.ha-1 in 2000. Seed yield increased in relation to the significant improvement in fruit number plant 1, average fruit size and weight. Yield components, leaf N, P, K and S, seed P and S, oil and protein content increased significantly with P application whereas leaf and seed Ca level declined. The substantial increases in seed yield, oil yield and protein content justify the recommendation of 16-20 kgP.ha 1 for optimum egusi seed production.
  S.O. Omotoso , O. JAyodele and C.O. Akinrinsola
  This study evaluated the effect of potassium fertilizer on the yield and nutrient composition of egusi (melon: citrullus lanatus) in southwestern Nigeria. Two soil medium classified as Iwo series (Oxic Paleustalf and Egbeda series (Oxic Paleustalf were used. The fertilizer materials were applied at 0,20,40,60 kgK.ha-1, as muriate of potash (MOP, 60% K2O) and were replicated four times in a randomized complete block design. Egusi (melon: Citrullus lanatus) fruit and seed yield increased significantly with rates of potassium (K) applied. Low soil exchangeable K could explain the significant responses in two years whereas the increase was slight in 2003 when the site contained higher exchangeable K and organic matter. The 20 kgK.ha-1 rate is optimum for egusi seed yield, in relation to the significant increase in fruit yield components: fruit number plant-1 and average fruit size (weight). Leaf N, P, K and S; seed P, K, S, oil and protein content increased significantly while leaf Ca decreased and seed Ca was not affected. The increases in seed and oil yield were substantial to justify the inclusion of 20 kgK. ha-1 in the fertilizer recommendation for sole Egusi production systems.
  S.O. Omotoso and O.S. Shittu
  This study was conducted to determine the effect of NPK fertilizer application rates and method of application on growth and yield of okra (Abelmoschus esculentus (L.) Moench) at the Teaching and Research Farm, University of Ado-Ekiti. Okra seed variety LD88 were treated to three levels of NPK fertilizer rates (0, 150 and 300 kg NPK ha-1) and two methods of fertilizer application (ring and band method). Treatments were arranged in a split-plot design with fertilizer application method as main plot factor and NPK rates as sub-plot factor. The treatments were replicated three times to give a total of eighteen experimental field plots. The result indicated that the fertilizer NPK significantly increase growth parameters (plant height, leaf area, root length, number of leaves), yield and yield components with optimum yield of okra obtained at 150 NPK kg ha-1 and ring method of application seems appropriate for okra production.
  S.O. Omotoso and G.E. Akinbola
  A rigid grid soil survey was carried out on a 1,295 hectares land at the transitional zone between Basement complex and Sedimentary soils of southwestern Nigeria at Atuagbo-Ekhilor, Edo State. Six mapping units were established. A fertility evaluation of the soils was carried out by examining and sampling the soils at 0-20 cm depth. The number of observation point was dependent on the areal coverage of the mapping units identified. Sample were processed and analyzed for eighteen parameters. Thevariability of individual property as indicated by coefficient of variation differed widely: Silt, clay and gravel, organic C, total N, Avail. P, Mn, B, Zn and K were highly variable (CV>35%) while sand, Ca, Mg, N and ECEC were moderately variable (CV 15-35%). Three properties pH, Exch acidity and Base saturation were least variable (CV<15%). The variance ratio test indicate that some properties which are most influenced by management significantly (p<0.01) affected the variability of the soil. Data of this kind would give a better understanding of the soil fertility of the area and planning of management practices to be employed for optimum output. Also, data of this kind should accompany soil survey report so that soil map users can have a better understanding of the soils they are working with.
  S.O. Omotoso and M.J. Falade
  This study was conducted to determine the effect of cow dung (manure) alone (CD), zinc sulphate alone, ZnSO4 (23% Zn) and their organo-mineral combination (CD+ZnSO4) on the performance of maize (Zea mays) at the Teaching and Research Farm of the University of Ado-Ekiti. The fertilizer treatments consisted of 0, 15 and 30 mg Zn kg 1 soil to give 9 treatment combinations replicated three times in a Complete Randomized Design (CRD). Growth parameters were measured at 7, 14, 21 and 28 days of growth while shoot weight and Zn uptake by the crop were determined at 28 days after planting. The result indicated that application of 30 mg Zn kg 1soil and organo-mineral combination (Cow dung+ZnSO4) significantly (p< 0.05) gave the highest plant shoot biomass (7.11 g pot 1) base on dry shoot weight. Also application of CD also led to the highest Zn uptake.
  S.O. Omotoso and O.S. Shittu
  This study was conducted to determine the effect of NPK fertilizer application rates and method of application on growth and yield of okra (Abelmoschus esculentus (L.) Moench) at the Teaching and Research Farm, University of Ado-Ekiti. Okra seed variety LD88 were treated to three levels of NPK fertilizer rates (0, 150 and 450 kg NPK ha 1) and 2 methods of fertilizer application (ring and band method). Treatments were arranged in a split-plot design with fertilizer application method as main plot factor and NPK rates as sub-plot factor. The treatments were replicated three times to give a total of eighteen experimental field plots. The result indicated that the fertilizer NPK significantly increase growth parameters (plant height, leaf area, root length, number of leaves), yield and yield components with optimum yield of okra obtained at 150 NPK kg ha 1 and ring method of application seems appropriate for okra production.
  B.O. Ademiluyi and S.O. Omotoso
  Green biomass of Tithonia diversifolia was incorporated into 3 groups of soil (degraded soil, used soil and fallowed soil) with the aim of finding its potential on soil fertility for maize (Zea mays) improvement. There was higher vegetative and reproductive growth of maize in the Tithonia incorporated soil. Early maize growth rate in terms of height and stem girth were better under tithonia applied soil than under the NPK fertilizer soils. Maize cob and grain yields were greatly increased by tithonia biomass than NPK fertilizer. Fallow + Tithonia gave cob and grain weight of 148.2 g pot 1,114.0 g pot 1 in 2003 and 147.5 g pot 1, 115.1 g pot 1 in 2004. An increase of 94 and 88% grain yield was obtained with tithonia incorporation while 79 and 80% grain yield was obtained in the NPK fertilizer applied soils in 2003 and 2004, respectively under the degraded soil group. It was observed therefore, that degraded soils could be recovered for crop production at low cost with tithonia than high cost of NPK fertilizer.
 
 
 
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