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Articles by J.D. Olarewaju
Total Records ( 3 ) for J.D. Olarewaju
  S.O. Alonge , F.O. Alonge , S.P. Bako , J.D. Olarewaju and O.B. Adeniji
  Field trials were conducted at two sites in Ahmadu Bello University, Samaru-Zaria, Nigeria, to determine the effect of five rates (0, 125, 2501, 2502 and 500 kg ha-1) of compound fertilizer (NPK 27:13:13) on the growth (root and shoot dry weight) and grain yield of three Amaranthus species. The Amaranthus species include: A. hybridus, A. spinosus and A. hybridus var. cruentus. The plants were sampled weekly between 4 and 7 Weeks After Planting (WAP) and the second dose of the fertilizer (for 125 and 2502 kg ha-1) was applied at 5 WAP. The best growth in the Amaranthus species resulted from 500 kg ha-1 NPK treatment at 4 and 5 WAP and from 2502 kg ha-1 NPK treatment at 6 and 7 WAP. The 2501 kg ha-1 NPK application also produced slightly higher values in growth parameters than 125 kg ha-1 at 4 and 5 WAP, but this situation was reversed at 6 and 7 WAP. The overall data showed that, 2502 kg ha-1 NPK treatment produced higher shoot growth and grain yield than the other treatments. Amaranthus hybridus had the highest shoot growth and total dry weight ha-1 than the other species. Amaranthus hybridus var. cruentus also produced the highest total grain weight per hectare than the other species. This study showed that, the split in contrast to sole application of NPK fertilizer rates can be of greater economic benefit in Amaranthus production.
  J.O. Ogunwole , A.B. Lawal , J.D. Olarewaju , K. Audu , D.I. Adekpe , O.O. Ugbabe , D.T. Yaro and E.Y. Oyinlola
  The agronomic, ecological and economic aspects of some organic waste application along with water harvesting techniques on the performance of off-season tomatoes and late season roselle and cotton in a dry land savanna agroecosystem were investigated. Different organic materials were applied as amendments to soil for tomato production under soil residual moisture condition. In addition, roselle and cotton were cultivated using tied ridge moisture conservation technique and different nutrient sources in a savanna Alfisols at Samaru, Nigeria. The use of organic amendments produced similar fruit yield with those tomato receiving mineral fertilizer amendment. Organic amendments produced tomato fruit with 70 to 80% marketable yield while, 84% of the fruit yield were marketable under mineral fertilizer application. Net income from sales of tomato under organic amendments showed that they could produce comparative profit margin with those produced from mineral fertilizers. Trace and heavy metal accumulation in tomato leaves were generally within the critical concentrations of those elements in plants. The tied ridge technique significantly increased cotton yield by 54% when compared with the conventional open ridge technique. In addition, cowdung amendment produced 42% more seed cotton than the recommended practice of using mineral fertilizer. Cost-benefit ratio revealed that the use of organic waste material in cotton production resulted in a positive net returns. Hence, application of organic waste to soils is potentially an important means of recovery of soil organic matter and an essential disposal method.
  Showemimo, F.A. and J.D. Olarewaju
  Three ‘tatasai` pepper varieties (Capsicum annuum L.) and one chilli variety (Capsicum frutescence L.) from diverse origin were grown for 2 years (1996 and 1997) in replicated field experiment. The pepper varieties were analysed for moisture, protein and trace elements. C. annuum (Pv1, Pv2 and Pv3) had higher moisture content than C. frutescence (Pv4). Percent proteins are higher in Pv3 and Pv4 using dry and wet digestion method, respectively. Cobalt, chromium, cadmium were low or absent in all the varieties. Zinc and copper are not in high quantity to harm both human and animals. Pv4 had unusually high quantity of iron (18.63mg/100g). Manganese and lead are less than 7mg/100g in all the pepper varieties.
 
 
 
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