SIRAJUL HOQUE - Academia.edu (original) (raw)

Papers by SIRAJUL HOQUE

Carbon content of humus in some freshwater wetland soil of Bangladesh

Bangladesh Journal of Botany

Dhaka University Journal of Biological Sciences, Feb 19, 2023

The soils of Ganges River Floodplain (GRFP), an important crop growing zone of the country, are k... more The soils of Ganges River Floodplain (GRFP), an important crop growing zone of the country, are known to be widely deficient in micronutrients. The study was conducted to relate the distribution and the fate of soil micronutrients in relation to land type, soil properties and cropping practices in GRFP. A total of 52 locations were selected for sample collection from across GRFP, varied in land type, soil series and cropping pattern, and analysed for DTPA extractable iron (Fe), manganese (Mn), copper (Cu), zinc (Zn) and hot water soluble boron (B). Most of the samples were found deficient in Zn and B, while a moderate number of samples were Fedeficient. The major reason of micronutrient deficiency was found to be high soil pH. Among the four soil series studied, Ghior series was most deficient in Zn and B, implying pedogenic differences among the soils. Significant effect of contrasting land types on the distribution of soil micronutrients was observed although the effect was not consistent. The rice-rice cropping pattern was found to have slightly higher contents of Mn, Zn and B compared to rice-non-rice pattern which might be due to longer submergence period in the soils under rice-rice pattern.

Effect of Organic Amendments on Cadmium Bioavailability in Soil and its Accumulation in Rice Grain

Bulletin of Environmental Contamination and Toxicology

A B S T R A C T This study focused on the isolation, characterization and identification of some ... more A B S T R A C T This study focused on the isolation, characterization and identification of some common soil bacterial strains with the aim of investigation of population diversity and comparison of species variation in industrial and agricultural soils. A total of 15 bacteria were isolated from four soil samples collected from Dhaka Export Processing Zone (DEPZ) at Savar (SE), Tannery area at Hajaribagh (ST), Dhaka, and two agricultural fields of Dhamrai (SD) and Kushtia (SK) in Bangladesh. After characterization of the isolates morphologically, physiologically and biochemically, they were identified provisionally as different species of Bacillus, Micrococcus, and Pseudomonas. For further confirmation by using PCR technique and 16S rRNA gene sequencing 4 isolates were identified as Micrococcus luteus strain P4_3 (from SE) and Bacillus megaterium strain H2 (from ST) from industrial soils and Bacillus amyloliquefaciens strain SCSAAB0007 (from SD) and Bacillus subtilis strain 1320 (fr...

Bangladesh Journal of Scientific and Industrial Research, 2018

To study the phosphorus transformation in soils, experiment was conducted in the laboratory. In t... more To study the phosphorus transformation in soils, experiment was conducted in the laboratory. In this study, three different bench-mark soil series of three different Agro-ecological Zones namely, Brahmaputra (Jamuna) floodplains (Dhamrai series, Areni-Eutric gleysols), Low Ganges River Floodplain (Ishurdi series, Chromi-calcaric Gleysols), and Madhupur Tract (Tejgaon series, Chromi-Calcaric Gleysols ) of Bangladesh were selected. For conducting this experiment, all the determination was performed triplicate. The changes of phosphorus fractions were discussed. Soil Phosphorus pools were assessed by sequential P fractionation on days 0, 7, 20 and 40. The inter conversions of different P- fractions were noticed during the course of incubation experiment. The magnitude of these changes differed among soils, being greatest in the Dhamrai soil. Principal component analysis of the data showed that the size of the P pools was related to soil properties; high concentrations of Ca-P were asso...

American Journal of Environmental Protection, 2016

This study aimed to determine the bacterial tolerance to chromium (Cr 6+) in three growth media, ... more This study aimed to determine the bacterial tolerance to chromium (Cr 6+) in three growth media, such as nutrient broth, Luria Bertani (LB) broth and mineral salt media in terms of Minimum Inhibitory Concentration (MICs). Among the seven metal resistant soil bacteria, Bacillus cereus isolate PGBw4 and Bacillus cereus strain ES-4a1showed highest tolerance against Cr 6+ in all three media. Bacillus cereus isolate PGBw4 was used as an effective and environment friendly agent for detoxifying Cr(VI) and reduction study in this research. The bacterial isolate mitigated toxic effects of Cr(VI) more efficiently from 100mg/L to 500mg/L within 24 and 48 hours respectively. The maximum amount of reduction of Chromium (VI) was 70.67 percent at 100 of Cr(VI) mg/L concentration after 48 hours of incubation and the lowest was 42 percent at 500mg/L Chromium concentration after 24 hours of incubation.

Open Journal of Soil Science, 2012

Establishment of phosphate (P) retention and release capacity of soils is essential for effective... more Establishment of phosphate (P) retention and release capacity of soils is essential for effective nutrient management and environmental protection. In this experiment, we studied the influence of soil properties on P desorption and the relationship between phosphate sorption and desorption. Among the soil series, the Ghior soil had the highest percent clay (59.32%) and free iron oxide (15,241 mg•kg −1) content. Along the catena of the calcareous soils, percent clay contents increased. For sorption study, the soils were equilibrated with 0.01 M CaCl 2 solution containing 0, 1, 2, 4, 8, 16, 25, 50, 100 and 150 mg•P•L −1 solution. For desorption, three extractants namely, 2 4 SO  (0.005 M) as Na 2 SO 4 , 3 HCO  (0.01 M) as NaHCO 3 and distilled water were used at extractant to soil ratios of 30:1, 60:1 and 100:1 (v/w). Among the sorption equations, the Langmuir equation showed better fit to the sorption data at higher P concentrations. The amount of phosphate desorbed by all the three extractants increased significantly with the increasing extractant to soil ratios. Phosphate desorption by 2 4 SO  and water molecules was highly correlated with pH, percent clay and free iron oxide content of the soil. Significant positive correlation (r > 0.64, P < 0.05) was observed between the amount of phosphate desorption and phosphate sorption maximum (b L). Phosphate desorption by 2 4 SO  and water molecules was also positively correlated with Freundlich constant, N (r > 0.67, P < 0.05) and EPC 0 (r > 0.72, P < 0.05). On the other hand, a significant negative correlation (r >-0.77, P < 0.05) was observed between phosphate desorption and phosphate binding strength (K L). The results suggest that freshly sorbed phosphate ions (inner-sphere complex forming species) can be readily desobed by outer-sphere complex forming species like sulphate and bicarbonate ions. Water molecules also desorbed significant amount of freshly sorbed phosphate from the soil colloids.

Bangladesh Journal of Scientific and Industrial Research, 2016

The present work was conducted to remove Pb and Zn from industrial effluents by coagulating the i... more The present work was conducted to remove Pb and Zn from industrial effluents by coagulating the ions with humic acids. Seven types of effluents were collected from textile, tannery and pharmaceutical industries. Two commercially available humic acids one in a liquid state and another one in a semi-solid state, humic acid extracted from peat were used to remove Pb and Zn from industrial effluents as well as synthetic waste water. Optical property, carbon concentration and coagulation threshold of humic acids were studied. Same carbon concentration (1 x 10-5 g L-1) of all the sources was maintained at neutral pH. The values of water soluble Pb and Zn in effluents were 0.000 - 0.0711 ?g/mL and 0.002 - 0.024 ?g/mL, respectively. Results indicated that liquid humic acid having E4: E6 ratio of 1.2 removed 100% Pb and Zn only from pharmaceutical effluent whereas humic acid extracted from peat having E4: E6 ratio of 3.18 completely (100%) removed these metals from pharmaceutical and tannery...

Journal article, 2023

Growth and Nutrient Uptake of Grain Legumes as Affected by Induced Compaction in Andisols

A greenhouse experiment was conducted to evaluate the effect of different levels of compaction on... more A greenhouse experiment was conducted to evaluate the effect of different levels of compaction on grain legumes viz. soybean, chickpea and lentil in different Andisols Plants were grown in different levels of surface compaction as (i) no compaction, (ii) medium compaction and (iii) high compaction. In this experiment, the effects of compaction on the shoot and root development and uptake of N, P, K, Ca, Mg, Fe, Mn, Zn and Cu were investigated. The plant dry weights differed among the crops for various compaction treatments. The yields of plants decreased with increase in soil compaction. The results obtained in the study revealed that compaction causes detrimental effects on uptake of nutrients both by shoot and root for all the crops except Ca uptake by root. This study indicated that in Andisols where increase in bulk density, though still lower than what would be critical in other soils, adversely affected the growth and uptake of nutrients by crops studied.

Variations in cadmium accumulation among amon rice cultivars in Bangladesh and associated human health risks

Environmental Science and Pollution Research

Rice consumption is one of the major cadmium (Cd) exposure routes for human. Bangladeshi people h... more Rice consumption is one of the major cadmium (Cd) exposure routes for human. Bangladeshi people have historically subsisted on a rice-based diet; however, only a few reports have investigated Cd accumulation by different rice cultivars in Bangladesh. This study was designed to investigate the uptake and accumulation of Cd in different rice cultivars and associated health risks to humans eating rice. A pot experiment was conducted to grow eight amon rice varieties under control, 5 and 10 mg Cd/kg soil under open air conditions. After harvesting the Cd fractionation, bioavailable Cd and rice grain Cd content were determined. Cd spiked as Cd2+ enriched the Cd bioavailability to plant by 35% (in 5 mg/kg stress) and 85% (in 10 mg/kg stress). There were variations among the rice varieties in their ability to accumulate Cd in grain and this was found to be 15-fold higher under control conditions. Grain Cd content significantly differed among the rice varieties at each level of soil Cd. In this study, BR-52 emerged as the most Cd-safe cultivar followed by BR-75, Rani salut, BR-71, BR-49, BR-76, BR-87 and lastly, BINA-7. Most of the agronomic parameters of rice concerning yield were affected by both rice varieties and soil Cd level. In different rice varieties, rhizosphere pH increased through root exudation which ultimately produced equilibria among the five major soil Cd fractions so that Cd became bioavailable to plants. All rice varieties showed high hazard quotient (HQ) values under Cd stress conditions and posed a risk to human health. For noncarcinogenic health risk assessment through HQ, we recommend 0.1 mg Cd/kg rice grain be used as the maximum allowable concentration (MAC) in calculating health risk for Bangladeshi people.

Applied and Environmental Soil Science

Organic matter (OM) degradation from amendments used in the remediation of metal-contaminated soi... more Organic matter (OM) degradation from amendments used in the remediation of metal-contaminated soils leads to modifications in soil chemical properties immediately after addition, which can also affect the soil metal distribution. Therefore, the speciation and potential mobility of heavy metals e.g., lead (Pb) and cadmium (Cd) were evaluated in three soils amended with OM. Soils, both spiked (with lead nitrate and cadmium nitrate solution) and unspiked, were treated with OM at a rate of 5 tons/ha in a moist condition. The samples were in incubation for 30 days in 30% moist condition. A chemical fractionation procedure was applied to determine the distribution of Pb and Cd in soils. The potential mobility of metals was also determined. Metals transformed from mobile to immobile fractions in both spiked and unspiked soils (not treated with organic matter), but OM increased the mobile fraction of Pb in unspiked soil and decreased it in spiked soil. In contrast, the mobile fraction of Cd...

Microbial mineralization of organic phosphate in soil

Plant and Soil, 1984

... Microbial mineralization, of organic phosphate in soil MAZ MOLLA, AA CHOWDHURY, Department of... more ... Microbial mineralization, of organic phosphate in soil MAZ MOLLA, AA CHOWDHURY, Department of Microbiology, University of Dhaka, Dhaka-2, Bangladesh A. ISLAM and S. HOQUE Department of Soil Science, University of Dhaka, Dhaka-2, Bangladesh ...

Journal of Invertebrate Pathology, 1997

Bacillus thuringiensis is distributed ubiquitously in the agricultural soil of Bangladesh. Simple... more Bacillus thuringiensis is distributed ubiquitously in the agricultural soil of Bangladesh. Simple correlation and regression analyses showed that the soil sand percentage and the available copper levels had significant negative and positive contributions, respectively, to the abundance and distribution of B. thuringiensis in the agricultural soil. Among the isolates, only 2.5% of strains showed larvicidal activity against the mosquito Culex quinquefasciatus. The larvicidal potency LD 50 varied from 3.5 ؋ 10 3 to 9.5 ؋ 10 7 spores per milliliter among the isolates. 1997 Academic Press

Archives of Agronomy and Soil Science, 2012

An experiment was conducted to observe the phosphate sorption potential of some soils of Banglade... more An experiment was conducted to observe the phosphate sorption potential of some soils of Bangladesh. Three soil series of calcareous origin, namely Sara (Aquic Eutrochrept), Gopalpur (Aquic Eutrochrept) and Ishurdi (Aeric Haplaquept), and two soil series of non-calcareous origin, namely Tejgaon (Rhodic Paleustult) and Ghatail (Aeric Haplaquept), were selected. The soils were equilibrated with dilute solution of calcium chloride containing graded concentrations of phosphate (0, 1, 2, 5, 10, 25 and 50 mg P mL 71), and the amount of phosphate sorbed or desorbed was determined. Although all the soils showed potential for sorbing phosphate from applied phosphorus, their ability to sorb phosphorus differed. Increasing rates of phosphate application increased the amount of P sorption but reduced phosphate sorption percentage in all soils except Tejgaon. Phosphate was sorbed by the soils in the order: Tejgaon 4 Ghatail 4 Ishurdi 4 Gopalpur 4 Sara at 50 mg P mL 71 application. Soils possessing higher amounts of free iron oxide and clay sorbed more phosphate from applied phosphorus.

Mineral composition and microbial association of a local condiment- 'Beat laban'(Black salt)

Dhaka University Journal of Biological Sciences, 2013

not available Dhaka Univ. J. Biol. Sci. 22(2): 183-186, 2013 (July)

The Egyptian Journal of Aquatic Research, 2021

In this investigation, the ability and effectiveness of the aquatic macrophyte, Pistia stratiotes... more In this investigation, the ability and effectiveness of the aquatic macrophyte, Pistia stratiotes L. to improve the quality of eutrophic waters were studied at a lab scale by testing across four lake water samples. The removal of salts, solids and improving physiochemical properties including pH, DO, EC, TDS, Turbidity and NaCl concentration of water were monitored. In treatment with the Aquatic Plant (AP), a 100% survival rate of the species was observed without any visible symptoms of toxicity in the biomass. The extensive root system of the plant as well as the body biomass improved water quality after one week of treatment as determined by a marked decrease in Turbidity, TDS, EC and NaCl and with an increase in pH and DO levels. The DO increased many folds over 168 h or 7 days after treatments and served as a useful indicator of water quality. Considerable variation percentages (either reduction or increment) were observed in different parameters treated with the phytoremediator. The study findings indicate that the aquatic macrophyte has a significant potential for improving water quality parameters by removing pollutants from eutrophic lake water bodies.

Water Practice and Technology

Dried ground roots of water hyacinth (Eichhornia crassipes) were used for removal of Pb(II) from ... more Dried ground roots of water hyacinth (Eichhornia crassipes) were used for removal of Pb(II) from aqueous solution. Batch adsorption experiments were conducted with the dried roots (0.1 g dry weight) using 100 mg/L of Pb(II) aqueous solution adjusted at pH 5.0. Equilibrium was obtained in 90 min with a 92% removal of Pb(II). The effect of contact time, pH, adsorbent dosage, initial metal ion concentration on the adsorption of Pb(II) were also studied. Kinetic studies indicated that the adsorption of Pb(II) followed the pseudo-second-order model with a reaction rate constant (k) of 0.0127 mg/(g.min). Kinetics data conforming to the pseudo-second-order model suggest that chemisorption was the rate-limiting step in the adsorption process. The adsorption data were found to fit best into the Langmuir model (R2 = 0.986). The maximum adsorption capacity was found to be ∼50 mg Pb(II) per g of dried roots. To investigate the feasibility of using the water hyacinth roots in a more realistic si...

Dhaka University Journal of Biological Sciences, 2017

The river Turag is the upper tributary of the river Buriganga in Bangladesh. Aerobic heterotrophi... more The river Turag is the upper tributary of the river Buriganga in Bangladesh. Aerobic heterotrophic bacterial count of the river in nutrient agar (NA) and peptone yeast extract glucose (PYG) agar media ranged from 2.91 × 105 to 27.5 × 105 cfu/ml and from 1.09 × 105 to 19.3 × 105 cfu/ml, respectively. Enteric and related bacterial count on MacConkey agar was between 0.88 × 103 and 20.8 × 103 cfu/ml. Out of 91 isolated bacterial isolates, 30 were selected based on their distinctive colony morphology for detailed study. Among these, 16 were Grampositive (53%) and 14 were Gram-negative (47%). Bacillus was dominant among the Gram-positive isolates (69%). The remaining were Brochothrix thermosphacta (6%), Caryophanon sp. (19%) and Renibacterium salmoninarum (6%). Fourteen Gram-negative, enteric and related isolates were identified as Plesiomonas shigelloides (43%), Alcaligenes denitrificans (22%), E. coli (14%), Proteus (14%) and Citrobacter freundii (7%). Biological oxygen demand (BOD) an...