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Articles by Osumanu H. Ahmed
Total Records ( 2 ) for Osumanu H. Ahmed
  Zuraidah Yahya , Aminuddin Husin , Jamal Talib , Jamarei Othman , Osumanu H. Ahmed and Mohamadu B. Jalloh
  Problem statement: Field practices involving the use of mechanization in oil palm plantations could result in soil compaction which alters the soil physical properties. The gradual deterioration of soil physical conditions could restrict the growth and function of roots. This study was carried out to evaluate the response of oil palm roots to changes in soil physical properties due to mechanization in Bernam series soil belonging to the clay texture class.Approach: Compaction treatments were imposed for 6 consecutive years and a comparison was done on the effects of different trailer weights on oil palm roots growth. Roots and soil were sampled using root and soil augers at 0-30 cm depth from the harvesting and frond pile paths. Results: The results showed that the oil palm roots were affected by the mechanization treatments. Growth of oil palm roots was significantly affected by the 4T trailer weight. Palms in compacted soil produced less primary and secondary roots but this was compensated for by the production of longer and thicker tertiary and quaternary roots. Conclusion: The compaction treatments affect the soil physical properties, which in turn affect the growth and distribution of oil palm roots.
  Lee J. Huey , Osumanu H. Ahmed and Nik M.A. Majid
  Problem statement: Humic acids are beneficial to soil aggregation, binding of heavy metal, plant growth and many more. However, the isolation of Humic Acids (HA) from its origin is not only time-consuming, but the isolation is also affected by factors such as temperature and the types of extractants and their concentrations. Different concentrations of extractant are said to alter the chemical characteristics of HA. Although this kind of information is important in HA studies, it is lacking for tropical peats. Approach: This study was conducted to investigate the yields and selected chemical element contents of HA isolated from tropical saprists peat as affected by NaOH and KOH with different concentrations. Humic acids were isolated from tropical saprists peat taken from Sarawak, Malaysia. Yields of HA and selected chemical properties were determined using standard procedures. Results: Yields of HA isolated using different concentrations of NaOH and KOH showed significant difference at each level of concentrations. For the chemical characteristics tested, only total acidity showed no significant difference. For TOC and ash, the KOH used exhibited inconsistent results compared to that of NaOH. As for E4/E6 values, the high values obtained suggests that HA in Sarawak peats contain relatively lower molecular weight. Conclusion: For the purpose of studying chemical characteristics, 0.2, 0.3 and 0.4 M of both NaOH and KOH were good enough to be used in isolating HA. This is because the results of study showed that these 3 levels of concentrations yielded HA with more homogenous chemical characteristics. On the other hand, extractants with higher concentrations are preferred when the yield of HA is of concern.

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