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Articles by S. Mustapha
Total Records ( 4 ) for S. Mustapha
  N. Voncir , S. Mustapha , V.A. Tenebe , A.L. Kumo and S. Kushwaha
  The content and distribution of extractable zinc within profiles along a toposequence at the Abubakar Tafawa Balewa University, Research Farm Bauchi, Nigeria was studied. Soil samples were collected from each identified horizon of five profile pits dug at the crest, upper slope, middle slope, lower slope and valley bottom positions and subjected to laboratory analysis. The soils were sandy loam at the top and sandy clay loam or clay loam in the subsoil. Clay content was generally higher in the subsoil than in the topsoil with the pH values ranged between 5.98 and 6.18. Organic carbon although generally low was higher in the topsoil than in the subsoil and not markedly different with position along the toposequence while CEC (although generally low 3.28-5.26 cmol kg-1) was higher in the subsoil than in the topsoil. The available phosphorus was also low in all the profiles and not markedly different between the profiles. Available zinc distribution followed the pattern of organic matter distribution and it was also low with no marked difference along the toposequence.
  S. Mustapha , N. Voncir , S. Umar and N.A. Abdulhamid
  This study has been conducted to assess the status and distribution of available Zinc (Zn), Copper (Cu), Iron (Fe) and Manganese (Mn) in soils of Akko Local Government Area (LGA), Gombe State, Nigeria. Sixty composite soil samples were collected from 0-15 and 15-30 cm depths from 15 purposively selected representative locations in the LGA and analyzed in the laboratory using standard procedures. Results obtained showed that the soils were generally clayey to sandy clay loams, slightly to moderately acid (pH range = 5.77 -6.5; mean = 6.1), low in organic carbon (mean = 0.83 g kg-1) and low to medium in exchangeable bases. Zinc was generally ‘low’ in all the locations (range = 0.13 to 0.37; mean = 0.22 mg kg-1), Cu ranged from ‘low’ (66.7%) to ‘medium’ (33.3%) while Fe (mean = 10.80 mg kg-1) and Mn (mean = 34.0 mg kg-1) were generally ‘high’ in content. Depth significantly (p<0.05) influenced the distribution of all the micronutrients studied except Fe that did not significantly vary with depth. For sustainable crop production, it is recommended that the pH be improved to near neutral. Crops grown in all the locations will benefit from Zn and organic matter application while areas identified ‘low’ for Cu should have Cu included in their fertilization programme.
  S. Mustapha , N. Voncir and S. Umar
  A study was conducted to determine the content and distribution of nitrogen forms in some soils of Akko Local Government Area (LGA) of Gombe State, Nigeria. A total of 60 composite soil samples were collected from 0-15 and 15-30 cm depths from purposively selected representative locations in the study area and analyzed using standard procedures. Results obtained showed that the soils were generally low in nitrogen, with organic nitrogen accounting for about 72.8% of the total nitrogen in the soils. The nitrogen forms followed the trend: total nitrogen>total organic nitrogen >NH4-N>NO3¯-N>NO2¯-N in content, while each of the nitrogen forms was more or less uniformly distributed in the study area. Owing to the low available nitrogen content in the soil (<12% of the total N), it is recommended that supplementary nitrogen application and improvement of the drainage conditions of all the soils be employed to improve the nitrogen status of the soils.
  M. El-Harbawi , Z. Azhani Bt. Razali , S.M. Faiz B Sy M Fuzi and S. Mustapha
  The purpose of this study was to develop a tool to determine the Safety Integrity Levels (SILs) using Layer of Protection Analysis (LOPA) method. Various methods can be used in determining this SIL. However, LOPA has been chosen as the risk-based approach to evaluate the potential consequences and likelihood. Many factors could be considered in order to complete this task. To implement LOPA procedure in the real situation, an industry plant operation had been selected as a case study. The work had been initiated by gathering the information on SIL. Event Tree Analysis (ETA) has been used to develop the scenarios of each initiating events. Then undesirable outcomes of accident scenarios have been calculated. A tool is developed to generate the scenarios or sequence of events that result in undesirable outcomes. Each scenario consists of two elements which are the initiating event that starts the chain of events and a consequence that results if the chain of events continues without interruption. Finally and after developing the scenarios, the identified initiating event frequency and related Independent Protection Layers (IPLs) is generated. There are 25 initiating events that have been listed in order to proceed with LOPA.
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