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Articles by C.F. Ishak
Total Records ( 3 ) for C.F. Ishak
  N. Alifar , A.R. Zaharah , C.F. Ishak and Y. Awang
  Selenium (Se) plays a major role in human and animal’s diet. Because of the low concentration of Se reported in staple foods such as rice, developing a Se fertilizer strategy would play a key role in increasing Se levels in the human body. Se uptake in relation to morphological root parameters among 6 lowland rice varieties was studied by conducting a solution culture experiment using modified Yoshida solution in Agriculture Faculty of University Putra Malaysia. Three Se levels were developed by the addition of 0, 20 and 200 mgL-1 Na2SeO3 and rice seedlings were harvested in week 4. Se uptake in roots of rice showed significant differences among all varieties and Se uptake significantly increased with increased in Se levels. Other root parameters (length, average diameter, surface area, volume and number of root tips) did not show any significant differences at different Se treatments.
  N. Alifar , A.R. Zaharah , C.F. Ishak , Y. Awang and B. Khayambashi
  Studies on Selenium adsorption was conducted in laboratory studies for some different rice growing soils of Malaysia at pH 4 and 7. Soils were equilibrated with 0.01 M CaCl2 and Na2SeO3 solution to measure relative adsorption of Selenium as sodium Selenite ions. In general, the adsorption of Se on different soils at both pH, increased with increase in the level of Se added. Adsorption data were fitted well to Langmuir model. Maximum adsorption (Qm) was correlated with organic carbon at both pH 4 (R = 0.77**) and pH 7 (R = 0.76**) and log K (R = 0.71** and R = 00.81**) at pH 4 and 7 respectively and also Qm was correlated with percent of clay (R = 0.59*) and CEC (R = 0.58*) at pH 7. Desorption data showed the higher amount of desorbed Se was achieved at pH 7 than pH 4 in all type of soil except TIP2, KBK, Mb and UPM.
  G. Sharifianpour , A.R. Zaharah , C.F. Ishak , M.M. Hanafi , B. Khayyambashi , N. Alifar and A. Sharifkhani
  Global efforts are under way to improve the Zn concentrations in rice to increase Zn in human diets. Therefore, this pot experiment was conducted to examine the effects of Zn sources and different composts on two upland rice varieties. This study was a 3 factors experiment with 3 replications arrange in RCBD. Experimental units include: 2 selected upland rice varieties with highest and lowest Zn uptake, 12 treatments, including 3 types of composts (oil palm compost, vermicompost and poultry compost) and 2 different sources of Zn (ZnSO4 and Zn-EDTA). Soil samples were analyzed before and after harvest. The plants were harvested 16-20 weeks after planting and analysed. All types of composts showed positive effects on Zn concentration and uptake in all parts of rice. Vermicompost is the most effective compost among these three composts. Both inorganic Zn sources used showed almost the same Zn concentration and uptake by rice in this experiment. The magnitude of Zn uptake response was magnified when zinc sulphate was applied along with organic compost. Application of Zn-amended organic composts increased the percentage distribution of Zn in grain more than the application of ZnSO4 or Zn-EDTA alone.
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