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Articles by A.R. Zaharah
Total Records ( 6 ) for A.R. Zaharah
  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.
  A.D. Amirruddin , F.M. Muharam and A.R. Zaharah
  Nitrogen (N) is one of the important elements for optimum growth as well as high yield in oil palm plantation industry. Hence, estimation of N content in plant tissue is crucial for plantation management to minimize cost of production to produce high yields. Conventional method such as foliar analysis is expensive and not a real time analysis. Implementation of chlorophyll meter and spectral approaches has been used widely in estimation of N in various types of crops but a few studies have been carried out with regard to oil palm. Therefore, this study was conducted to evaluate multiple proximal sensors for N estimation in mature oil palm. The experiment was conducted in a plantation setup in Randomized Complete Block Design (RCBD) with three replications. Three levels of N treatments; 0, 1 and 2 kg N per palm per year as ammonium chloride were applied in split applications within two different planting years’ plots. The data was collected in February and October 2014. The combination of physiological and spectral models fit the best (R2 = 1.00) for foliar N or N rate estimation in matured oil palm. Generally, SPAD meter was not suitable to estimate N content in matured oil palm leaves but the function can be compensated by the spectroradiometer. The variation of single and combination of single physiological or spectral models in estimating N was highly influenced by age and sampling time. Palm stem diameter was important in this study though it is not sensor-measured.
  C.C. Sim and A.R. Zaharah
  Rubidium is widely used as a tracer for potassium in many physiological studies because its physicochemical properties are similar to potassium. The usage of rubidium as tracer are often used with caution as several plant species were able to selectively acquire potassium over rubidium. However, its usage depends on the non-selective absorption of potassium and rubidium by the plant. Therefore a study to determine the absorption of potassium and rubidium by oil palm and measure the potassium uptake rate was conducted. Results showed that the uptake of potassium and rubidium was similar making rubidium a suitable tracer for potassium in oil palm. Prior to reaching potassium saturation in the root, the non-lignified “white”root tip segment were actively absorbing 86Rb at a rate of 194.9 cpm/g/h. The rate of 86Rb uptake would then correlate to rate of uptake at approximately 16 pM of potassium per gram per hour. As excised root tip were use, the root almost reaches it saturation phase after 8 h of uptake. The maximum activity of 86Rb absorbed by the excised root plateaued at 586 cpm g-1.
  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.
  H. Siti Aishah , A.R. Saberi , R.A. Halim and A.R. Zaharah
  To investigate the effects of osmotic stress on forage sorghum (Sorghum bicolor L. Moench) varieties at critical stage of seed germination, i.e., at which salinization is initiated. A study was conducted at the Seed Technology Laboratory at University of Putra Malaysia (UPM- lab.) from October to November 2007. Two forage sorghum varieties (Speedfeed and KFS4) were evaluated in the salinity levels of 0, 5, 10, 15 dS m-1. The experimental design was Completely Random Design (CRD), which was based on factorial with 3 replications. In the experiment, seeds were germinated in covered, sterilized, disposable Petri dishes. Three parameters, namely germination percentage, germination rate, germination index and coefficient velocity of germination were estimated. The results of this study showed that different levels of salinity had significantly affected the germination percentage, germination rate germination index. In addition, a significant difference (1%) was also found in the germination percentage between the two varieties. Meanwhile, the mean comparison of the treatments showed that the germination percentage in distilled water (S1) was the highest (92.5%) and salinity dS m-1 (S4) had the lowest germination percentage. The maximum germination rate (35.58) and germination index (391.67) were retrieved from EC 0 and with the increasing salinity, these parameters were decreased. The evaluation of the two varieties showed that KFS4 (V1) had a higher germination percentage (82.91%) than the speed feed (72.5%). Consequently, the seed germination of KFS4 was better than the speed feed (in salty water and non-stress conditions). In other words, salt stress had been found to delay germination of both varieties.
  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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