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Articles by R.I. Mahmood
Total Records ( 2 ) for R.I. Mahmood
  M.J. Islam , Shah Md. Helal Uddin , M.W. Zaman , R.I. Mahmood and M.S. Rahman
  A study was conducted to evaluate the water quality at Matiranga Upazilla under Khagrachari Hill District of Bangladesh. pH values (6.72-7.54) indicated that groundwater was slightly acidic to neutral. Ca (0.4-6.90 mg L-1) Mg (0.55-6.60 mg L-1), Na (4.00-44.00 mg L-1), K (4.75-13.50 mg L-1), HCO3 (0.15-1.20 me L-1 ) and CI (0.30-1.60 me L-1) were predominant along with Zn, Mn and P in lesser amounts. Fe, Cu, As, B and SO4 were found trace to very little amounts. Total dissolved solids (TDS) and sodium adsorption ratio (SAR) values were 35-200 mg L-1 and 0.36-3.40 respectively and indicated that all water were under freshwater’ and excellent’ class respectively. In terms of soluble sodium percentage (SSP), most water was doubtful. SAR (0.36-3.40) and EC (52-300 μS cm-1) values classified the water as CI-SI except one as C2-S1. All water was under the category of soft regarding hardness with ‘suitable’ RSC. Based on As, Fe, Mn, Zn, SO4, NO3 and CI all water was within the safe limit for drinking except 3 samples for Mn and one for As.
  B. Roy , M.R. Alam , Bikash C. Sarker , M.S. Rahman , M.J. Islam , M.A. Hakim and R.I. Mahmood
  An experiment was conducted on naturally occurring growth substances in aqueous extracts of some common weeds viz., Bathua (Chenopodium album), Bhijli ghas (Striga densiflora), Shetdrone (Leucus aspera), Mutha (Cyperus rotundus ), Chapra (Eleusine indica) and Khude Anguli (Digitaria ischaemum) with the attempt for chemical investigation on effective extracts. Boiled and unboiled extracts of all the weed species under test significantly reduced and delayed germination of wheat and jute seeds compared with control. The highest germination (96 and 85.3%) and maximum growth of wheat and jute were observed in seeds treated with control. The effect of boiled and unboiled extracts of Bathua (Chenopodium album) showed the lowest germination in seeds of wheat. The root and shoot length of wheat and jute were also decreased in presence of the weed extracts. The thin layer chromatography (TLC) examination of crude extract of Khude Anguli (Digitaria ischaemum) showed four separate compound at hex: ethyl acetate (20:1, v/v) and the crude extract of Bathua (Chenopodium album) showed three separate component at hex: ethyl acetate (10:1, v/v).
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