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Articles by A.A. Mamun
Total Records ( 4 ) for A.A. Mamun
  M. Shahadat Hossain , A.A. Mamun , Rikta Basak , M.N. Newaj and M.K. Anam
  The experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, Bangladesh during July to December 2001 to investigate the effect of Cultivar and spacing on weed infestation and performance of transplant Aman rice. Thirteen weed species belonging to eight families infested in the experimental plots. Cultivar, spacing and their interaction significantly affected weed density and weed dry weight. Cultivar significantly influenced all the crop characters studied with the exception of panicle length. Sonar Bangla 1 produced the highest grain and straw yields and Nizershail the lowest. Spacing had a significant effect on all the crop characters except panicle length and 1000-grain weight. The highest grain yield was obtained from the spacing 15x 25cm and the lowest grain yield was produced by the widest spacing 25 x 35cm. Sonar Bangla 1 produced the highest grain yield in 15x25 cm spacing and Nizershail produced the lowest yield in 25 x 35cm spacing.
  M.Z. Hossain , S.M.A. Hossain , M.P. Anwar , M.R.A. Sarker and A.A. Mamun
  An experiment was conducted at the Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh from July to December, 2001 to study the performance of BRRI Dhan 32 in SRI and conventional methods and their technology mixes. The experiment was laid out in a split-plot design with three replications. The treatments used in the experiment consisted of (A) two planting methods viz., i) SRI planting method and ii) conventional planting method, (B) two types root placement e.g., i) J shape and ii) L shape and (C) three sources of fertilization viz., i) chemical fertilizer (N-60, P2O5-40, K2O-40, S-10, Zn-5 kg ha-1, respectively) ii) organic fertilizer (cowdung, 10 t ha-1) and iii) 50% chemical fertilizer + 50% organic fertilizer. Grain and straw yields were the highest (5.6 and 5.98 t ha-1, respectively) in SRI planting method. The highest grain yield of SRI planting method was mostly the outcome of higher total number of tillers hill-1, highest panicle length and highest number of grains panicle. Conventional planting method produced the lowest grain and straw yields (3.65 and 4.29 t ha-1, respectively). Among root placement methods L shape root placement found to be better and produced higher grain yield (4.97 t ha-1). Fertilization with 50% chemical fertilizer + 50% organic fertilizer performed the best regarding both grain and straw yields. The highest grain yield (5.04 t ha-1) and straw yield (5.67 t ha-1) were produced when 50% chemical + 50% organic were applied while the lowest ones were recorded in chemical fertilizer.

  A.A. Mamun , F.R. Ma`an , A.K. Zahirah , M.A. Yehya , A.R.S. Mohammed , M.Z. Alam , S.A. Muyibi , I.A. Faris and I. Azni
  Contamination of water due to arsenic (As) is increasing in many parts of the world. The removal of As from aqueous solution by using impregnated carbon nanofibres (CNFs) as the adsorbent is reported in this paper. The effects of pH, CNFs dosage, contact time and initial concentration of arsenic were studied at room temperature (±25°C). The interactions among the parameters were also investigated. The data obtained from the adsorption experiment were analysed using statistical software in order to develop a regression equation to represent the optimum operating conditions. The interactions of each parameters were considered during this analysis and the result indicated that the highest removal (97.25%) of As can be attained at pH 6, initial concentration of arsenic of 0.08 mg L-1, contact time of 60 min and CNF dosage of 200 mg L-1. Comparison between impregnated CNF and Powdered Activated Carbon (PAC) were also done and it is determined that impregnated CNF has better removal compared to PAC alone. The final concentration of As after the treatment using CNFs was about 8 ~ 10 times less than that of using PAC. Therefore, it can be concluded that CNFs are highly potential for the adsorption of As from water.
  M.N. Bari , M.Z. Alam , S.A. Muyibi , P. Jamal and A.A. Mamun
  An investigation was carried out to evaluate the effect of different particle size of oil palm Empty Fruit Bunches (EFB) and their distribution as new substrate for the production of citric acid through Solid State Bioconversion (SSB) in laboratory scale by Aspergillus niger. The experiment was carried out to observe the productivity of citric acid with different particle size of EFB in 250 mL Erlenmeyer flasks. The result obtained through this study showed that the 0.5 mm down graded particle of EFB gave the highest production of citric acid compared to other particle size. The maximum production of citric acid of 131.3 g kg-1-EFB with the production rate of 16.4 g kg-1-day was obtained from EFB with particle size of 0.5 mm after 8 days of bioconversion. Furthermore, the results of particle size distribution show that the well-graded particle size of EFB produced the highest citric acid compared to uniformly-graded and gap-graded particle.
 
 
 
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