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Articles by Mohd Khanif Yusop
Total Records ( 4 ) for Mohd Khanif Yusop
  Susilawati Kasim , Osumanu Haruna Ahmed , Nik Muhamad Ab. Majid , Mohd Khanif Yusop and Mohamadu Boyie Jalloh
  Problem statement: Fertilizer N use efficiency is reduced by ammonia volatilization. Under low soil CEC and high pH, N from soil solution is released to the atmosphere. Ammonia loss due to low worldwide N use efficiency (33%) has been implicated in global warming. Thus, the objectives of this laboratory study were to evaluate the effectiveness of liquid humic and fulvic acids, isolated from tropical peat soils in reducing N loss from urea fertilizer as well as to investigate the ability of these acids to retain NH4+ and NO3¯ or reduce soil pH.
Approach: Formulated liquid N fertilizers consisting of urea and different types of humic molecules (HA or FA or mixture of both), solid and liquid urea were surface applied to 250 g of soil. A closed dynamic air flow system was used to trap NH3 loss in boric acid after which samples were titrated with 0.01 M HCl to estimate NH3 loss. After 30 days of incubation, the soil was air dried and analysed for pH, exchangeable NH4+, available NO3¯ and exchangeable cations. The results were analysed using SAS and treatments means were compared using Duncan’s New Multiple Range Test (DNMRT).
The use of humic molecules reduced NH3 loss and increased exchangeable NH4+. The high CEC of Humic Acids (HA) made the LHA treatment the best in reducing N loss after surface application. The presence of HA and Fulvic Acids (FA) increased NH4+ recovery. Even though, the soil pH of all the treatments were high, significant reduction of N loss was observed for humic molecules treatments.
The use of liquid organic N fertilizer has the ability to reduce NH3 volatilization in acid soil. The use of both humic and fulvic acids could be effective in promoting NH4+ retention. Thus, it can be concluding that, humic substances, in general, have great ability in controlling NH3 loss and retaining NH4+ in acid soils. It could be a cheapest, practical and easiest way to control N loss.
  Susilawati Kasim , Osumanu Haruna Ahmed , Nik Muhamad Ab. Majid and Mohd Khanif Yusop
  The objectives of this study were: To investigate whether a purification period of HA isolated from Hemists peat soils could be reduced and to investigate whether distilled water could be used to purify HA isolated from Hemists peat soils. Standard procedures were used to extract and fractionate HA in a Hemists peat soil. The isolated HA was purified by suspending the HA 50 mL distilled water, centrifuged for 10 minutes, supernatant decanted and the liquor analyzed for K, Ca, Mg and Na by atomic absorption spectrophotometry. The entire procedure was repeated five times after which the purified HA samples were oven dried at 40ºC to a constant weight. Washing HA for 5 consecutive times (10 min for each washing) reduced the ash (mineral matter) content of the HA to an acceptance level of 2%. This finding was associated with significant decrease in K, Ca, Mg and Na contents with increased washing time. This observation also suggests that the distilled water used during the purification process served as Bronsted-Lowry acid thereby donating more H+ which may have replaced some of K+, Ca2+, Mg2+ and Na+ at the exchange sites of the HA. The C, carboxylic COOH, phenolic OH, total acidity and E4/E6 values of the purified HA were consistent with standard values, a further indication of the effectiveness of using distilled water in purifying HA from Hemists peat soil. Humic acids isolated from Hemists peat soil can be purified within one hour using distilled water without altering the true nature of HA.
  Makilan Muniandy , Osumanu Haruna Ahmed , Nik Muhamad Ab. Majid and Mohd Khanif Yusop
  Problem Statement: Peatlands are natural sequesters of carbon and nitrogen. Once they are disturbed the tendency to lose carbon and nitrogen to the environment is very high. This study investigated the effect of converting peat land forest into oil palm plantation on soil chemical properties with particular emphasis on carbon and nitrogen storage. Approach: Soil samples were collected randomly at depths 0-25 and 25-50 cm from a secondary forest and from four different ages of oil palm plantations at woodman oil palm plantation located in Sarawak, Malaysia. Soil pH in water and KCl, Organic Matter (OM), Organic Carbon (OC), Total Nitrogen (TN), Organic Nitrogen (ON), ammonium, nitrate, available phosphorous, carbon to nitrogen ratio, carbon to phosphorous ratio and bulk density were determined using standard procedures. The bulk density method was used to quantify Carbon (C), Nitrogen (N), ammonium, nitrate and available phosphorous storage on per hectare basis. Results: Statistical analysis showed that the OC content was statistically similar for all soil depths and vegetation types (forest or plantation). The TN content was statistically higher for secondary forest. Conclusion: Regardless of depth, C sequestration was not altered due to land use change but the secondary forest had higher stores of soil N.
  Mehdi Karimizarchi , Aminuddin Husin , Mohd Khanif Yusop and Radziah Othman
  Knowledge of elemental Sulphur (S) oxidation and its effect on soil chemical properties is seamlessly required before it can be recommended for use as a soil amendment or acidulate source. Therefore, a batch experiment was carried out to quantify various S fractions and to study how elemental S amendment affects S dynamics in Bintang series soil. Results showed that elemental S, applied up to 1 g S kg-1 soil, was successfully oxidized and converted to both organic and inorganic forms. While inorganic water soluble S appeared to be the predominant form of S, comprising more than 65% of total S, for Bintang series soil amended with elemental S rate of 0.25 g S kg-1 and more, organic form of S was the major form, comprising more than 96% of total S, in the soil amended with 0.125 g S kg-1 and less. Regarding soil remediation, elemental sulphur will be efficient for enhancing soil micronutrient availability and it can act as a source of some micronutrients for agricultural practices in Bintang Series soil.
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