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Articles by S.K. Biswas
Total Records ( 2 ) for S.K. Biswas
  N.M. Mozaddedul Haque , M. Fazle Rabbi , A.N.M. Rezaul Haq Karim , Mainul and S.K. Biswas
  Chemical analysis of Bankalmi, Polygonum hydropiper was evaluated against rice hispa beetle. Hot water extracts of Bankalmi (Ipomoea sepiaria) and Bishkatali (Polygonum hydropiper) (1:10; W:V) can efficiently controlled the hispa beetle. Bankalmi leaf extract with 25-95% ethyl alcohol gave 70-100% mortality of rice hispa. However, 95% alcohol itself killed 100% of the test insect population indicating unsuitable for Bankalmi leaf extraction. But it can be extracted with 25-50% ethanol. Hexane itself killed all the insects and was not suitable as solvent to extract Bankalmi active ingredient. Comparing the three methods of leaf extraction (Soxhlet and two crude methods), Soxhlet methods gave higher mortalities of rice hispa beetles than the others.
  M. A. Siddiquee , S.K. Biswas and N. Ferdous
  The study was conducted to find the rate of accumulation of dry matter, protein, amylose and total amino acid in developing grain in boro season of 1997. Moisture content in paddy varied from 24.0&madsh;57.0% in Hbj IV and 24.0&madsh;61.0% in BR3. At 4 DAF, HbjIV and BR3 had 5.4 and 4.4 mg/paddy dry matter respectively and the accumulated dry matter in paddy was 22.5 and 29.3 mg respectively in HbjIV and BR3 after 20 DAF. Moisture content was higher in brown rice than paddy during grain development. Accumulated dry matter in brown rice varied from3.1-16.7 mg in Hbj IV and 1.3&madsh;22.7 mg in BR3. Amylose content accumulation rate in brown rice was slower in BR3 compared to Hbj IV during first 8 days. Total protein and total free amino acid in grains of brown rice increased up to 16 DAF in the tested varieties.
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