Browsing by Author "Hoque, S."

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    A study of availability of soil nitrogen by various extractants
    (Bangladesh J. Sci. Res., 1989) Hossain, A. K. M. A.; Hoque, S.; Mandal, R.; Khan, T. H.
    Available nitrogen was determined using 11 extractants on 29 soils covering a wide range of physical and chemical properties. Assessment of 2M KCI (p H 7.0), IN NaCI, IN NaCI (pH 1.0), 2N NaCI, IN Na2S04 ( p H l .O ) , 0.5N NaHCOa ( pH 8.5 ), Morgan’s reagent, O.IN C a C h , 0.5N HCl, 0.7N HCI and 0.5N H2SO4 extractable nitrogen showed that the best efficiency was obtained by IN NaCI. IN NaCI and 2M KCI extractable nitrogen bear significant relationship with soil organic matter and total nitrogen were found to be dependent on the type of soil. Correlation study with nitrogen uptake by BR-4 rice reveals that 2M KCI is superior to IN NaCI and closely followed by IN NaCI. Compared to these two extractants both aerobic and anaerobic incubation methods produced less satisfactory results.
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    Comparison of methods to evaluate k availability in rice soils
    (Srilankan Journal of Agricultural Sciences, 1988) Islam, A.; Hoque, S.; Mandal, R.; Chowdhury, S. A.
    tions have been used to evaluate K availability from 29 rice soils. Of the methodsy boiling IN HNO^ extracted the highest amount of available K. The methods may be arranged as boiling IN HNO2 > hot 1.4N H^SO > IN Na^SO. (pH 1) > modified IN NaCl (pH 1) > 0.7N HCl > 0.5N HCl > Morgan’s reagent > 0.5M NaHCO^ (pH 8.5) > IN NaCl > IN NH^OAa > Water according to their relative efficiency. Extractants having acidic character were found to he superior over other methods. pH fluctuations possibly accentuated K release from the soils. All the methods correlated significantly with 60 days plant K. Highly significant correlation at 0.1% level was revealed by boiling 1 N HNO^j hot 1.4N H^SO^, IN NaCl (pH 1) and 0.5M NaHCO. (pH 8.5) with plant K. Only IN NaCl (pH 1) extractable K showed significant correlation with 90 days plant K.
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    Evidence of bacterial activity in the release of arsenic: a case study from the Bengal delta of Bangladesh
    (Jour. Geol. Soc., 2003-02) Khan, A. A.; Hoque, S.; Huq, S. M. Imamul; Kibria, K. Q.; Hoque, M. A.
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    Positive impact of high calorie diet on body weight of malnutrished children with shigellosis[abstract]
    (1993) Mazumder, R.N.; Kabir, I.; Ashraf, H.; Hoque, S.; Mahalanabis, Dilip