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Articles by Radziah Othman
Total Records ( 7 ) for Radziah Othman
  Gholam Reza Rahbar , Mohmed Musa Hanafi , Sayyed Ahang Kowsar and Radziah Othman
  Desertification control through Flood Water Spreading (FWS) mainly for the Artificial Recharge of Groundwater (ARG) is comprehensive study that is being implemented since Jan. 1963 in the Gareh Bygone Plain (GBP) in Southern of Iran. Total 8 ARG system with a total area of 1365 ha were constructed during the 1983-1987 period on the debris cone and alluvial fan formed by the Bisheh Zard river an ephemeral stream that supplies floodwater to the GBP from none to 8 times a year. The appearance of sowbugs (Hemilepistus shirazi Schuttz) in the sedimentation basins of the Artificial Recharge of Groundwater (ARG) systems in the Gareh Bygone Plain (GBP) in Southern Iran is considered an ecological breakthrough in desertification control. This crustacean which drills 7-8 mm holes down to 1.8 m in the freshly laid sediment and sand, facilitates preferential flow of water towards the aquifers. Particle size distribution, saturation percentage, pH, Electrical Conductivity (EC) and concentration of major cations and anions, Cation Exchangeable Capacity (CEC) and trace elements were determined using the standard procedures. The burrowed material was highly concentrated in macro- and micro-elements. pH was lowered by 1.4 units in the same material. Saturation percentage of water has been increased 2-folds comparison with control. In this reason, sowbug can be in a desert region in the research station. The amount of total nitrogen in burrowed materials has changed 13-folds in comparison with control. The burrowed material was highly concentrated in organic carbon in comparison with control (7-folds) and show a significant difference in 1% level. The concentration of iron, zinc, manganese and copper due to sowbug activities have increased (3.13, 3.8, 4.9 and 12.7-folds, respectively) and show a significant difference in 1% level. Results show that the physico-chemical properties of burrowed materials are more fertile in comparison with control. Moreover by bringing up, the excavated material sowbugs affect the surface soil composition in a long time.
  Ali A.A. Mustafa , Radziah Othman , M.A. Zainal Abidin and V. Ganesan
  A glasshouse study was conducted to investigate the growth response of sweet corn (Zea mays) to mycorrhizal fungi inoculation over different plant ages (2, 4, 6, 8 and 10 weeks) and to determine the interaction between the host and mycorrhizal fungus on mycorrhizal development, using soil substrate as inoculum for Glomus mosseae. Inoculation had no significant effect on growth parameters in plants harvested at early ages in terms of plant height, total root length, root and shoot dry weights. The significant effect of mycorrhizal inoculation was observed on plants of eight weeks old. Percentage of mycorrhizal colonization and number of spores increased significantly at plants of 2 weeks old (24.1 and 39.2%), respectively while; the highest AMF spores level was recorded at plants of four weeks old. Inoculation with G. mosseae enhanced growth of sweet corn by increasing concentration of N, P and K (24.2, 8.4 and 18.2%), respectively. We concluded that the mycorrhizal inoculation need a time (not less than one month in sweet corn) until showed the beneficial effects on host plant to be desired.
  Alireza Shafieizargar , Yahya Awang , Freydun Ajamgard , Abdul Shukor Juraimi , Radziah Othman and Ahmad Kalantar Ahmadi
  Changes in concentrations of Na, Cl and K, proline and Relative Water Contet (RWC) of five citrus species (Cleopatra mandarin, Carrizo citrange, Tiwanica, Bacraii and Shaker) grown in four NaCl salinity levels (0, 25, 50 and 75 mM NaCl) for the purpose of assessing their magnitude of susceptibility to salinity and estimating the salt tolerance degree were studied. The Na and Cl concentrations increased whilst K concentration in leaves decreased with increasing NaCl concentration in the rootzone. Shaker and Cleopatra mandarin accumulated optimal concentration of the ions in their tissues. Increasing NaCl concentration reduced RWC and increased proline content in plant tissues. Shaker and Cleopatra mandarin rootstocks maintained relatively higher leaf RWC and proline in comparison to other rootstocks. Cleopatra mandarin and Shaker showed to be markedly less affected by salinity up to 50 mM NaCl and could bear the highest salinity levels (75 mM) imposed in this study.
  Monther Mohumad Tahat , Kamaruzaman Sijam and Radziah Othman
  The life cycle of arbuscular mycorrhizal fungi (AMF) is initiated by spore germination. The interaction between Glomus mosseae and Ralstonia solanacearum was achieved by following the bio-compartmental in vitro system. The system was modified to be useful for different microbes with different types of medium. Mycorrhizal fungi spores were germinated using water agar, nutrient agar and soil media, while casamino acid-peptone-glucose (CPG) media was used for R. solanacearum.all medium. All medium were mixed with different volumes of tomato and corn root exudates. The hyphal length of G. mosseae greatly affected by the exudates particularly, mycorrhizal tomato root exudates (MTRE) and mycorrhizal corn root exudates (MCRE). The growth of R. solanacearum was suppressed due to G. mosseae spores germination which can produce different volatile and non volatiles substances. The aim of this experiment was to investigate the influence of root exudates volatiles on R. solanacearum and the hyphal of G. mosseae growth under laboratory conditions using a new modified technique.
  Fardin Sadegh-Zadeh , Samsuri Abd Wahid , Dzolkhifli Omar , Radziah Othman , Bahi Jalili Seh-Bardan and Nur-Aisyah Sajudi
  In this study we compared the High Performance Liquid Chromatography (HPLC-UV) and the Ultraviolet (UV) spectrophotometry methods for measuring the herbicide napropamide concentrations in soil solution during batch equilibrium sorption study. Experiments were conducted to compare the calibration curves, recovery in background solution and spiked soil samples, intra and inter day precision and mass balance of the two methods. Mass balance of napropamide in the sorption study was determined from the difference between the initial napropamide content in the supernatant and the equilibrium concentration. Although DOC interfered with UV wave absorption by napropamide in the UV-spectrophotometry method, it was easily corrected by using a blank solution containing the same amount and type of DOC as used in the sample. The intra and inter day precision experiments indicated the measured napropamide concentrations using both methods were equally reproducible and consistent. The recovery of napropamide from spiked soil samples decreased with increasing amount of clay and organic matter but recoveries for both methods exceeded 88% and the recovery of the UV-spectrophotometry method was comparable to the HPLC. The measured concentrations of napropamide in soil solution supernatant used for the sorption study showed no significant differences between the two methods. We found that the UV-spectrophotometry method was reliable to determine the concentration of napropamide in the supernatant of the soil solution used in the sorption study. Therefore, the UV-spectrophotometry method can be used as an alternative method to HPLC for determination of napropamide concentration in soil batch equilibrium sorption study.
  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.
  Gholam Reza Rahbar , Mohmed Musa Hanafi , Sayyed Ahang Kowsar and Radziah Othman
  Desertification control through Floodwater Spreading (FWS) mainly for the Artificial Recharge of Groundwater (ARG) is comprehensive study that is being implemented since, Jan. 1983 in the Gareh Bygone Plain (GBP) in Southern of Iran. Eight ARG systems with a total area of 1365 ha were constructed during the 1983-1987 period on the debris cone and alluvial fan formed by the Bisheh Zard river, an ephemeral stream that supplies floodwater to the GBP from none to 8 times a year. The inevitable Malthusian dilemma however may be delayed through the application of the artificial recharge of groundwater methods using the turbid floodwaters that abound in most deserts. While soil building is a highly desirable outcome of the ARG activities, formation of a hard crust that substantially decreases infiltrability of sedimentation basins and recharge ponds is a negative attribute of using turbid waters for the ARG. This problem was delicately solved by nature when a population of sowbug (Hemilepistus shirazi Schuttz) invaded the ARG systems in the Gareh Bygone plain in Southern Iran. The burrows made by this crustacean have a circular opening 7 mm in diameter and reach a depth of 80 cm. The infiltration rate of the areas punctured by the burrows as determined by the double ring method had increased 4.2 fold in some plots, in comparison with control. Statistical investigation shows that there is a significant difference between sowbug and control. This difference was significant at the 1% level. Cautious introduction of plants attractive to this useful organism is an environmentally sound and a financially viable method of lengthening the economic life of the ARG system.
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